Synthetic for old Celica?

You are going to have to clear that with Ray first.

Yes it is. I don't care if the oil is glistening with the sweat of a thousand slippery eels, I still will not extend the oil change interval beyond 5k. With the exception of replacing used up additives, oil does not go bad. The whole purpose of changing oil is to remove the dirt from the engine. It doesn't matter what type of oil you use, a filter is only capable of holding a certain amount of dirt before it becomes clogged. And if it becomes clogged, the oil will be bypassed and you are running on unfiltered oil from that point. One can spew all the oil jargon they want, nothing will change my mind that extended oil changes are a bad idea. I don't care if the oil is glistening with the sweat of a million slippery eels. It will be filthy dirt loaded slippery oil after an extended amount of time. That a car has 300k on it means little, except that whoever took care of it likely did not use extended oil change schedules. Changing to such a plan is a good way to ensure it doesn't make 400k.. :( I use syntec blend, but I do not modify my oil change schedule vs dino oil. It's still 5k, and 5k is actually longer than I often went in other cars I have owned. I actually prefer 3-4 K. But my present corolla is clean enough operating that I can get away with 5k changes. In the future as it develops more blow by, etc, I may actually go to lesser mile change schedule. And what anyone posts here about oil is not going to change my mind. Toyota tried a 7500 mile oil change sked and it bit them in the ass big time with lots of gelling problems. They saw the light and went back to 5k. BTW, I use syntec in the corolla, but all my other ford trucks are regular dino oil. The *only* reason I use the syntec is to add a small degree of protection against gelling due to heat. If if were not for that issue, I would use the regular old dino oil in it too. Extended oil changes are a bad idea in my book, no matter how good the oil is. MK

Agreed. I change out my SYN oil every 6000 KILOmetres.

I don't believe that Toyota ever had a 5000 mile interval prior to their

7500 interval (for non-severe service), unless it was a long time ago. Until the recent change in oil change intervals, it was 7500 miles or 5000 miles for severe service conditions. So unless I am wrong, they did not "go back" to an earlier interval. What changed was a new engine design, that because of emission improvements, required more frequent oil changes.

If everyone had been using a full synthetic, I can guarantee you that no one would have been having sludge problems with a 7500 change interval unless they were pouring sludge down the crankcase.

I am surprised no one else has mentioned this yet but after all of the bickering about the disclosure of what oil Ray uses I would like to mention that in my (and MANY others) humble opinions Syntec is NOT synthetic oil being only group 3 instead of group 4 thus Ray hasn't actually been using synthetic oil after all and this whole ongoing battle is suddenly a moot point.

Daniel (uses Mobil 1 5W30 Non-EP and a Wix 51773 filter on a '95 Dodge Grand Caravan 3.3)

"Daniel Who Wants to Know" wrote in message news:kfOsj.32616$9j6.19847@attbi_s22...

Hmmm, let's muddy the waters a little more. I switched to Syntec 2 oil changes ago because it was cheaper than Mobil 1 and a friend who works for Castrol says it is good stuff. Before that, it was Mobil 1.

"Daniel Who Wants to Know" wrote in message news:kfOsj.32616$9j6.19847@attbi_s22...

That cannot be correct. Ray is expert on Motor Oil.

LOL I was trying to lighten the situation a bit but I guess I forgot the d:) . BTW the van (which I just bought) has 223,000 miles on it and I switched to syn anyway. In case you don't know part numbers the 51773 filter is a ~1.5 quart beast with the same threads, gasket, and bypass valve specs as the .5 quart 51085 stock filter and the 51515 1 quart filter. I know this is the Toyota NG but just a side note to Ford and Chrysler owners on here.