DoctorD415

I just recently got an 85 GT. What type of oil shouldI use when i change it?

WhiteWindsor

Ask the previous owner what he used. And change it according to how you drive it. Good rule of thumb is every 3000 miles or 3 months.

GT350

Mobil 1.........good enuf for NASA... good enuf for me.

90_Mustang_GT

Royal Purple. Motor Oil, Tranny Oil, and Rear End. If you dont want to spend that kind of money, use some kind of synthetic. Ya theres arguments that it may make your car leak oil and all, but you are not gonna beat a full synthetic oil, no way around it. Disipates heat, lubes better, easier start up, resists breakdown, 100% better.

TwotoneVert

Thats what I use too. I dont know for sure, but I have heard that is ok to switch from regular oil to synthetic, but not from synthetic to regular oil.

86GT 93LX

i was considering becoming an ams oil dealer, they claim unless it says 100% synthetic that its just a highly refined conventional oil. and also say once you use it you shouldnt switch back.who knows. personally i use 10-w-30 in my mustangs.unless your racing i would just go with reg brand oils

86GreenMachine

My car didnt leak oil till i used royal purple.That pissed me right off.Nom i use quaker state b\c thats what my engine was broke in on.

TwotoneVert

86, is AMS oil the stuff they claim you can drain the oil and drive it around without damage. Not that I would do it, but I saw some tests on speedvision where they drained the oil from several cars and then drove them around a track.

92hatchLX

valvoline high mileage 5w30

Jmag034

cheapest out there, running synthetic in a car that has used conventional for 50,000 + miles is never a good idea