what oil Options

[fiddler69]

gt4 st205 what grade of engine engine oil are you guys recommending please

[Bitter]

Oil pump seals are always catastrophic failures, same for oil cooler seals. They're under pressure, when they let go they really gush a whole lot of oil very quickly. It's a 15+yr old car, so pretty much shame on you for never having changed the oil pump seal as they're KNOWN to be a problem with the 5S, same for the oil cooler seal as well. Blaming synthetic oil for lack of maintenance is like blaming Smith and Wesson for killing people.

[Special_Edy]

Oil pump seals are always catastrophic failures, same for oil cooler seals. They're under pressure, when they let go they really gush a whole lot of oil very quickly. It's a 15+yr old car, so pretty much shame on you for never having changed the oil pump seal as they're KNOWN to be a problem with the 5S, same for the oil cooler seal as well. Blaming synthetic oil for lack of maintenance is like blaming Smith and Wesson for killing people.

Shame on me for never having changed the oil pump seal on the car I paid $300 for.
If I had the oil pump off I would have replaced the gasket, but like the other 99.9% of celica owners I didnt replace every nut and bolt on the car just because. If I was that concerned I would have replaced the entire engine, not torn the whole timing assembly off to change one little gasket. Perhaps the most relevant bit of information here is whether or not the OP has recently changed every single gasket on his engine that touches oil. If not, shame on him according to you and dont use synthetic oil according to me. If he has changed every single gasket, then we both agree he can go ahead and use synthetic oil if he wishes.

If you reread my posts you will see that I already stated the oil pump and oil cooler gaskets are under pressure. So you have just invalidated your earlier arguement that the leaks were already there but got worse from the synthetic(also if the leaks were present, synthetic oil would instantaneously worsen the leak, not suddenly start gushing oil a week later).

Unless you have proof that can contribute to the arguement you are just making guesses and conjectures. Another member and I have stated that we first hand have experienced gasket failures following a switch to synthetic from conventional. Its up to the OP if he wants to accept your opinions or our facts.