The only reason they recommend 5w is because of the EPA and all the federal regulations for gas mileage...... They dont really care if 10w does a better job at protecting the engine, so they use 5w because it gets better gas mileage (supposedly, you probably couldnt really tell anyway)........ But back when your car was made, they didnt really care about the feds (or the regulations werent as strict)..........Ralph said:Most new cars recommend 5w 30, but our climate changes and even during the winter it can warm up for a few days at a time. 10w30 is thin enough for winter (for me) but for summer I personally would not use 5w30, too thin on hot days I've heard for the older cars.
Question, for all these little new cars, the manufacturer recommends 5w30 even in the summer. For my car they recommend 10w30 for all season, but you can use 5w30 in winter if you want. I guess my question is what makes my v8 overheat with 5w30 in sumer and not the new Acuras, etc with a 4 banger?
Yes, I think it does. It leaves a nice coating on everything that doesn't drip off as easily as the fossil stuff does. Supposedly it helps to protect better during cold starts.njgeno said:I am away from home for extended periods of time, up to 4-6 weeks. I try to have someone drive the vehicle occassionally but sometimes it is not possible. Will the synthetic help in that situation (extended periods of non-use).