- Feb 28, 2017
- the True North Strong and Free
Hi all, New to the forums but have viewed threads on many occasions. Impressed with the amount of knowledge and the quality of information that I have seen thus far on this forum. I own a 1990 Toyota Hilux Surf with a 2.4L 2L-T 4 cylinder IDI turbodiesel engine in it, that originally came from Japan. My concern is what oil to put in it. The FSM for my engine calls for 10w-30 to 15w-40 (for my climate/temperature range) API grade CF-4, but then in brackets says (you may also use CF, CE or CD). These specs of oil are all obsolete, and I have been running Shell Rotella T 15w-40 in it, which is CJ-4 as I'm sure you guys are aware (this is what my old man runs in his 6BT Cummins), with oil changes every 5000km and filter changes every 10000km. After doing some research online about oil specification, I am now under the impression that by running a diesel engine oil that is overspec'ed for my engine, I run the risk or bore glazing if I run the engine under "light-duty" conditions. Most of my driving is highway, with speeds around 100-115km/h, 2800-3000rpm and 600-900*F exhaust temperatures, which I feel does give the engine a good workout, but I am unsure if this consitutes "light-duty" or "severe-duty" operation. I do putter around town with it as well. I now see that Shell has discontinued the Rotella T oil and replaced it with Rotella T4, which is CK-4 spec and I feel is probably way overspec'ed for my engine. My problem is, I'm having a hard time finding a suitable oil to run in it. I noticed that some "gasoline engine" PCMOs are rated for CF as well as SN, or SJ or whatever. Would an oil like this be better suited to an older diesel like mine that calls for CF-4? Or are those oils primarily for gas engines with marginal service ratings for diesel applications? These Toyota IDI engines are known to be fairly sooty, and I plan on disabling the EGR soon. My engine has about 145,000km on it right now, and does use some oil between changes. Some of it leaks from the rear main, but I am pretty sure at the current rate of disappearance that some of it is being burned. So my questions are, what type of oil would you guys recommend for this truck? How much of a risk is bore glazing when using an overspec'ed oil doing my type of driving? Do you think that the oil consumption could be a result of bore glazing? Many thanks in advance.