Mobile One 15W 50 Synthetic - Land Rover Forums : Land Rover and Range Rover Forum
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post #1 of 25 (permalink) Old 09-09-2019, 12:33 AM Thread Starter
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Mobile One 15W 50 Synthetic

I have a 1999 Discovery II.

Some guy said not to use this or it would blow the oil pump and make the truck run hotter. He said its like maple syrup ...and the pump has to work harder and will pump slower ..

Can anyone verify if this is correct? I've been using Mobile One 10W 40 Synthetic ... Fifteen+ years on this truck. Same oil. I've decided to upgrade to Mobile One 15W 50 Synthetic .. because the temps here are over 100 degrees everyday...

1999 LR DII Performance Package with various Mods
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post #2 of 25 (permalink) Old 09-09-2019, 03:10 AM
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If you live in a very cold climate it may be a little thick at startup. In a warmer climate it will be ideal.
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post #3 of 25 (permalink) Old 09-09-2019, 03:29 AM
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I'd go with a synth 15W-40 just to throw that into the conversation.


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- 2001 Discovery 2 SE (NAS LHD) MYRTLE, 110K miles, 4.0L V8, NGK Iridium IX plugs, PCV mod, 180* T-stat, Hayden fan clutch/Dorman fan, removed TBH, SAI modded K&N filter, Safari Gard steel guards, Warn XD9000i winch, KO2 265/75R16 on steel rims, EBC rotors/Akebono pads, +2 TF lift & LEDs
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post #4 of 25 (permalink) Old 09-09-2019, 05:13 AM
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I'd go with a synth 15W-40 just to through that into the conversation.

What do you believe the benefits to be of 15W40 over 15W50?
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post #5 of 25 (permalink) Old 09-09-2019, 11:45 AM Thread Starter
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Ok well ..
Ladies and Gents .. I put Mobile One 15W 50 Synthetic after reading a review from some guy with an avatar photo of a French women committing suicide on a toilet .. and added 1 bottle of ZDDP Zinc

And the Rover engine sounds better !

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #6 of 25 (permalink) Old 09-09-2019, 04:45 PM
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Originally Posted by WLADiscoII99 View Post
Ok well ..
Ladies and Gents .. I put Mobile One 15W 50 Synthetic after reading a review from some guy with an avatar photo of a French women committing suicide on a toilet .. and added 1 bottle of ZDDP Zinc

And the Rover engine sounds better !
You run the risk of destroying your motor by adding ZDDP.
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post #7 of 25 (permalink) Old 09-10-2019, 02:29 PM Thread Starter
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You run the risk of destroying your motor by adding ZDDP.
I have a 99 DII. Engine is a flat tappet.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #8 of 25 (permalink) Old 09-10-2019, 03:56 PM
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Originally Posted by WLADiscoII99 View Post
I have a 99 DII. Engine is a flat tappet.
So???
Too much of the stuff will eat into the metal of the motor components. If you added a bottle of concentrate you have most likely raised the levels above what is considered safe.
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post #9 of 25 (permalink) Old 09-10-2019, 04:11 PM Thread Starter
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So???
Too much of the stuff will eat into the metal of the motor components. If you added a bottle of concentrate you have most likely raised the levels above what is considered safe.


I purchased this

https://zddplus.com/zddplus-oil-additive/

I don't know if it's too much. I just dumped it in. I don't have any cats.

1999 LR DII Performance Package with various Mods
Valentine One
Passport 9500ix
6 x Anti-Theft Camera System
2 x Anti-Theft Tracking devices
Veil Laser Paint
Anti-Laser Police Laser Jammer (5 heads + Dragon Eye protection) + Parking Sensors
Police Scanner + Waze
Powerful Pro-tuned CB-Radio with Fire-Stik
Remote+Hardwired License Plate Concealer
Armormax Bullet Proof Glass
Armormax Caltrop Deployment System
Steel Undercarriage Guards (Steering, Diff axles, Gas tank)
Voyager Roof Rack+six Jerrycans and five stacked Rotopax
Maxxis Razr Offroad Tires+Lift+LED bar
Allisport UK Aluminum Radiator
Allisport UK aluminum coolant tank with sight glass and coolant level sensor
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post #10 of 25 (permalink) Old 09-10-2019, 04:32 PM
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Originally Posted by WLADiscoII99 View Post
I purchased this

https://zddplus.com/zddplus-oil-additive/

I don't know if it's too much. I just dumped it in. I don't have any cats.
Maybe you should stop putting snake oil in your motor.
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post #11 of 25 (permalink) Old 09-10-2019, 05:36 PM
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15W oil is not a recommended option for a D2 according to the WSM issued by the vehicle's manufacturer... but what do they know?


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post #12 of 25 (permalink) Old 09-10-2019, 07:27 PM
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15W oil is not a recommended option for a D2 according to the WSM issued by the vehicle's manufacturer... but what do they know?
But they do recommend a 10w/60. The 60 being viscosity at the normal operating temp of the engine. The 10w or 15W really only applies for the first few minutes of the engine starting. After that the upper figure is more relevant. Not that easy to get 10w/60, but a lot more common to get a 15w/60, which is what I use. I have found that 20W is a little thick on startup on very cold mornings, but 15W seems OK in warmer climates. I would not be using 15W in a region where it snows regularly.
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post #13 of 25 (permalink) Old 09-11-2019, 03:52 PM
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Just my 2 bits.
I bought my D2 from a land rover mechanic with 50+ years experience. He used and I still use Rotella 15w40.
Never had a complaint from the motor. 180,000 miles on it. Replaced head gaskets at 130,000 but who hasn't?
Added some AT-250 to the oil about 3000 miles ago to recondition the rubber from the inside out. It seems to have helped noticeably. A lot less oil on the floor.
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post #14 of 25 (permalink) Old 09-11-2019, 04:07 PM
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Originally Posted by sierrafery View Post
15W oil is not a recommended option for a D2 according to the WSM issued by the vehicle's manufacturer... but what do they know?

They also didn't plan on the extreme heat we have here in the US, as compared to over there (hence HG issues). Should be good with 15/50 if you are still in Vegas/desert.

I'm still using Rotella. I was using 10/30 but after moving to Phoenix, where's the heat is a bit extreme, I upped that to 15/40... probably won't change till the motor is done since I already have 150K on her, just no point.

I'd get that snake oil out of the truck now though...

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post #15 of 25 (permalink) Old 09-11-2019, 05:24 PM
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