Just finished overhauling the 2F, transmission and transfer case on my '82 FJ40. I've always used plain 10W40 in the engine and 80W90 in the gear boxes since the truck was new. After the engine breaks in, I'm considering switching to synthetic oils.
There's a lot of information available on the web, but it's difficult to sort out truth from marketing hype in this area. Does anyone here have experience running synthetic oil in the 2F? Is any benefit worth the additional cost? Anyone have problems with the synthetics in our older-technology engines? What weight oil do you use?
I have to say that my engine & gearbox internals still looked pretty good after running 20+ years on plain petroleum based oil, so I hesitate to change what's working without good expectation of improvement.
Buck
There's a lot of information available on the web, but it's difficult to sort out truth from marketing hype in this area. Does anyone here have experience running synthetic oil in the 2F? Is any benefit worth the additional cost? Anyone have problems with the synthetics in our older-technology engines? What weight oil do you use?
I have to say that my engine & gearbox internals still looked pretty good after running 20+ years on plain petroleum based oil, so I hesitate to change what's working without good expectation of improvement.
Buck