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View Full Version : Recommended oil weight for high mileage motor



oldschoolRXowner
09-26-2010, 05:55 PM
I just bought a 94 celica GT 5 speed from the original owner but I still have to go back to prior owner to pick the orig manual and such; however, she lives 1 hour away from me.

It is the original motor with 260XXX miles. What oil weight do you guys recommend? It has been 20 years since I last owned a yota

---------- Post added at 09:55 AM ---------- Previous post was at 09:17 AM ----------

I know its 10w30 but I want to know if 20w50 will be safe

Grot
09-26-2010, 08:03 PM
Id run 10w40 in it.

20w50 it gonna be a little too think, especially with cold weather coming shortly.

oldschoolRXowner
09-26-2010, 08:43 PM
thank you.

Murgatroy
09-26-2010, 09:34 PM
I ran 20w50 for years. In cold weather as well.

It depends on where you live?

I run 10w40 now, and I frankly can't tell a difference.

Castol GTX all the way.

joe's gt
09-27-2010, 06:00 AM
Old, non-performance cars, just use cheaper dino oil like GTX as Murg already mentioned. And yeah, 10-40 is what you want, cuz clearances loosen up as the motor gets gets higher in miles. For a colder climate, you could go with a 5-40. Honestly though, if its not a performance car, its not a huge issue.you'd probably be just as fine running 10-30 as 5-50.

85gtsblackman
09-27-2010, 07:25 AM
I just bought a 94 celica GT 5 speed from the original owner but I still have to go back to prior owner to pick the orig manual and such; however, she lives 1 hour away from me.

It is the original motor with 260XXX miles. What oil weight do you guys recommend? It has been 20 years since I last owned a yota

---------- Post added at 09:55 AM ---------- Previous post was at 09:17 AM ----------

I know its 10w30 but I want to know if 20w50 will be safe

all toyotas ive ever had with alot of abuse or over 200,000 miles ive run castrol 20w50

use castrol 20w50

oldschoolRXowner
09-27-2010, 01:50 PM
thank you all for the input. I'm in Southern CA btw.

lue
09-27-2010, 06:58 PM
they say to run 10w30 or 10w40 but i have always been using the w30 in all conditions from cold to hot.

KoreanJoey
09-28-2010, 03:41 AM
Um... stick w/ the factory told you. If you need to make repairs, make them. Changing to heavier weight oil is just a bandaid to actually fixing any problems it has.

/end 2cents

ALAN
10-10-2010, 07:45 AM
I just bought a 98 ST204 (5S-FE) with 97000kms (65000miles approx) and I've just run through three oil changes in quick succession to see what sounded best in the motor , not attall scientific I know, but I'm 61 years old and I've yet to loose a motor so it works for me.

I live on the Gold Coast in Australia , it's generaly warm 20-30c in the day sometimes it gets hotter and seldom below 10c at night.

I used an Australian brand -Penrite--who have a reputation for producing very good quality products at a fair price.

First was 10/30+10 full synthetic , the +10 seems to be unique to Penrite it is a hybrid oil that wieghs at 40 but has many of the fast flowing characteristics of a 30 , anyhoo no good for this engine , induced lots of rattly running sounds , flicked it--.

Next was 20x50 +10 semi synthetic way to heavy engine sounded exactly like an engine does with heavy oil in it , a bit like trying to talk with a mouth full of boiled eggs., --flicked it--

Next 10x40+10 semi synthetic, perfect, I can hear everything that going on in the engine but no rattly top so plenty of oil is moving around , all good.
Kept it.

My thoughts would be a 10x40 or a 10 or 15x50 semi synthetiic with that many miles up see how they sound

Facime
10-10-2010, 05:53 PM
20w50 is a mistake imho. Most people have the wrong idea of how oil in an engine actually works and what it does. Oil acts as a cushion in bearing gaps, and that effect is far more important thats its lubricating properties when it comes to engine life. In an HVLP system as most of our motors are this makes oil weight more important. Running too thick of an oil can starve the bearings of this cushion and lead to premature rod knock.

If you are having trouble with leakage, KJ is right, fix your issues. A thicker oil is counter-intuitive to me and in most cases I recommend a thinner oil with a little ATF (8-16oz.) mixed in for a high mileage motor you just picked up.

edit: I also dont recommend synthetic right off the bat for a high mileage car you just got. First of all its too expensive to just leak out, or "burn" off. Secondly, the smaller molecules make leakage more likely. I would run at least a first course of 5w30 Catrol gtx with the mentioned ATF for the first oil change and then determine if the car is holding oil or using it at an unacceptable rate.

oldschoolRXowner
10-10-2010, 08:15 PM
I went with 10w40, will see how it goes..thanks all for the input. I use 20w50 on all of my 5 rotaries (3 RX-3 and 2 RX-7), I just thought going that route with the celica will kinda save me some pain.

Facime
10-11-2010, 01:37 AM
a rotary is a whole different animal

bzdweezy
10-11-2010, 05:04 AM
Yup 10w-40 should be fine for your climate, stay with dino or a high mileage oil (i think it has seal/gasket conditioners to prevent leaks) with a 3.5-5k intervals with a good oil filter like Toyota and you'll be set for hopefully another 260k miles.