You IL guys do seem good at killing the heartiest engine in the country.

Heartier then an LS1?

If you change to syn, you'll be runing an oil with much more detergents in it, which cleans out your oiling system. It also unplugs holes that may be clogged with gunk. Is it worth it on an engine with 150k? I dunno. I switched @ 112 and got away with no problems. Synthetic doesn't break down at the end of it'* life like dino oil, which is the big selling point of it. It also does better in high heat situations.

Same reasons why I usually switch over....but the others have a good point also.

My first 93 SSEi had 147,000 miles on it when i switched to Mobil 1, didnt leak before, and then it did, a decent ammount, ended up changing the pan gasket, which was one of the leaks but not all of them.
I would recommend dino juice for sure.

I thinking I will go over to mobil 1 high milage oil I am sure that is blend oil. So how old blue likes it.

i switched around 115k, just about 6 or 7 months ago (or was it longer? time flies) on my '96, and I didn't have an increase in my leakage . Since I changed my pan gasket (recommend, it'* easy enough if yours is leaking), I barely loose any between changes...

I think it really boils down to, if your engine leaks with synthetic, the benefits of synthetic are all gone. Personally, Mobil One is one of THE best oils out there. Just pick some up, put it in, change the oil again at 3,000mi, then after that change do it again at 5,000mi. It will pay for itself after a few times of 5,000mil changes. Oh yeah, and if you get the 'new' mobil one with 5k, 7.5k, and 15k oil, pick up the 15k, it'* the full synthetic. If you have oil leaks within the first 3,000mi, then just switch back to regular oil.


-justin

I think you missed the point of the warnings. The leaks would be caused by the synthetic oil and detergents breaking down deposits and sludge that naturally plug or prevent leaks. After the change to synthetic, if it causes leaks, it'* because this buildup and sludge is GONE. Switching back to Dinosaur juice at this point would NOT stop the leaks caused by the switch to synthetic.

As well if you considered going to one of the higher mileage Mobil'* you should definately use their filter. They plan their specs around it.

I thought the synthetic leaks were due to it being thinner and could get through places easier?

The mobil one oil filter is one of the best out there, at least from the oil filter tests I have seen. Nothing compares . No matter the oil you use.


-justin