Oil change, any ideas on what oil to use?? Options

[Ronnie5]

I have a 1990 celica st185 gt4 I want to do an oil change but not sure what oil to use, its done 159.000 miles can anyone help??

[Silver94CelicaOw...]

I know Castrol Syntec is usually cheaper than Mobil here. I used to use Mobil 1 synthetic and it was a huge difference in smoothness over "dinosaur oil". Now I put in Castrol Syntec just because its cheaper, and the bottle is a little easier to pour.

Really any synthetic is great, but if you can afford it get Royal Purple. Its supposedly lightyears beyond anything that petroleum companies selling synthetics are making....much more durable and protective.

[Negative]

I know Castrol Syntec is usually cheaper than Mobil here. I used to use Mobil 1 synthetic and it was a huge difference in smoothness over "dinosaur oil". Now I put in Castrol Syntec just because its cheaper, and the bottle is a little easier to pour.

Really any synthetic is great, but if you can afford it get Royal Purple. Its supposedly lightyears beyond anything that petroleum companies selling synthetics are making....much more durable and protective.

I am an engineer who designs lubrication systems for a living everyday and I will say this:
Royal Purple is the only oil we do not reccommend and will void our warranty. The seals used in our systems are automotive engine seals and the royal purple attacks them - especially on older seals that are used to regular dino-oil. My educated .02 - stay away from Royal Purple - the benifits are not worth the risk.

BTW - my 4th gen swap loved M1 15w50 for the turbo engine. just don't use it on newer engines - stay with 10w30 or 10w40 would be even better. Turbos need thicker oil as they cause the oil to break down faster. or just more frequent oil changes which costs more.

This post has been edited by Negative: Apr 10, 2006 - 11:22 AM

[Ronnie5]

I know Castrol Syntec is usually cheaper than Mobil here. I used to use Mobil 1 synthetic and it was a huge difference in smoothness over "dinosaur oil". Now I put in Castrol Syntec just because its cheaper, and the bottle is a little easier to pour.

Really any synthetic is great, but if you can afford it get Royal Purple. Its supposedly lightyears beyond anything that petroleum companies selling synthetics are making....much more durable and protective.

I am an engineer who designs lubrication systems for a living everyday and I will say this:
Royal Purple is the only oil we do not reccommend and will void our warranty. The seals used in our systems are automotive engine seals and the royal purple attacks them - especially on older seals that are used to regular dino-oil. My educated .02 - stay away from Royal Purple - the benifits are not worth the risk.

BTW - my 4th gen swap loved M1 15w50 for the turbo engine. just don't use it on newer engines - stay with 10w30 or 10w40 would be even better. Turbos need thicker oil as they cause the oil to break down faster. or just more frequent oil changes which costs more.

lucky you told me that I shall give that a miss! and stick with somthing else! thanks