Crankcase Type / Weight

[nickvash0104]

Stupid question, yes... spec, according to Autozone, is 20W50. What should I be running in a rebuilt n/a with about 50,000 on it? Turns out the previous owner threw 10W30 full syn. in there, so I'm stuck with full syn

[mrnickleye]

Factory is 10-40w, but 20-50w is fine for summer when its hot alot. I always use 20-50w in everything with over 100k on the bottom end. 20-50w will help slow down oil consumption of leaks or smoking.

[hangsupra]

same on me using the 20w50 on my mk2 supra too.. hehe... n beside that its a turbo to...

[nickvash0104]

What's the reccommended minimum temp. for 20W50? It's not going to get below 0 degrees F, if below 15F at all this year here in Dallas.

[supra_91]

i use 10W-30 b/c that's what my owners manual says....and i have about 37,000 miles on the original motor

[nickvash0104]

All right, Joel was saying it's 10W40, supra_1 says it's 10W30... which is the accurate spec?

[supra_91]

u can use 10W40....my owners manual recommends 10W40 for colder weather

[rnoswal]

And you are not stuck with synthetic just because it is in there. You can drain it and just add petroleum based oil if you want. You don't have to have a professional do some sort of magic cleaning to it to make it safe or anything like that.


Russ

[nickvash0104]

... could you perhaps elaborate on that, Russ? I've read via Consumer Reports and ASE Master Techs that full syn. isn't really better than conventional. I'd rather pay the ~$2-3 / qt. rather than the ~$5-6 / qt. for synthetic. So, if possible, I'd rather run conventional.

[Burn N' Up]

I'll be taking most of my expierence for this "?" from my 1981 Landcruiser FJ60 but engines all need oil for the same reason, and I do run 20w-50 in my 89' 7MTGE. The Supra owners manual shows ranges of operating temperatures, if your in those ranges you can pick any of those oils. Now lets think about turbos for a second. Spinning a ridiculous RPM on a single shaft that is lubricated with that same engine oil. I think i'd rather not risk the melt down and lost the 3hp or whatever that thicker oil supposedly takes from you. Plus the car will last longer overall.

I base the lasting on the fact that my 81 cruiser has had 20w-50 synth in it since the day it had its first oil change and doesn't burn ANY oil now with no repairs to the engine what so ever. I'll agree it doesn't rev as high but i'll also say it has 200K on it, 200K of hills, sand, and off road use. Thats tough on an engine.

Regular air filter cleaning and oil changes at 2500 like the manual says for rought driving saves the engine. You can go 5K between changes but c'mon, you and me both know your not driving that thing like granny on her way to church, at least I know i'm not.

Just how I would treat my babies.

I'm going to be posting on the forum about redline oils since i'm about to run redline in every oil needing space in my 7MGTE as far as how they perform.

Edit: Also as far as synthetic goes. The earth never expected you to put dead dinosaurs in your car. The boys over at R&D (research and development) expected you to put synth in your car. Just a thought.