I have 3 classics and work at the dealer, Iam not boastin by any means it is just related to the answer and its reasoning.
at the shop we use 5w30 straigth for every engine regardless of mileage or vintage. the BMW engine in the 03 to 05 range and the freelander require synthetic all over and a special mineral in their trannies. all others get synthetic upon request
I have been using synthetic axle grease on my cvs for about 7 years now, as well as differential transfer case and transmission.
10w30 on the motors all castrol. some of it can be pricey.....I still do maintennance at regualr factory reccomended intervals and if I off road every weekend that particular truck gets fresh lower fluids and greases the following monday and gets ready for the next weekend. ( by lower fluids i mean axle diff, cv inspect and drve shaft lube).
I have found that this way I have had to do less hard part replacement specially wheel bearings, the transmission is more forgiving to higher temps and the engine mantains a contant idle thru-out the time. during winter, cold star ups are nice and smooth
all my engines are scheduled to be up dated to 4.6 by next year simply because, my 87
was overhauled some 50k miles ago with a 13 to 1 compression ratio and it is beggining to show its age, my 90 is scheduled to be sold and it has a new 3.9 with 4.6 heads and my 95 was overheated by my wife when the thermostat failed.
all of these new engines have used and will use synthetic, I have found a long term advantage in maintenance and wear and tear benefits.
just my personal experience and I thought it would be a good time to share.
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