i routinely use full synthetic (5w-30), it seems to run a little better and certainly turns over better in the winter.
I'm currently sitting at 56k miles.
Also, when is a good time to throw some seafoam into the engine to give it a good cleaning? (or is seafoam just a better version of what i posted above?)
Rev the snot out of the car a couple of times a month and the car will be fine . I only once used a fuel injector cleaner and it made it a little better but in the end I had to replace it anyway.
My vote goes to now for anything else other than regular maintenance and change your oil.
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2004 Pontiac Grand Prix GTP CompG -- Supercharged 3800 V6 ??,??? km
??,??? miles
I've posted a couple of times about using Marvel Mystery Oil in my gas for cleaning up sticking/fouled injector(s) in my 2.4 Alero. I used various injector cleaners to no avail but the MMO did the trick. I also put it in the oil about a week before an oil change. I've used MMO for more years than most of you have been alive and in many different types of motors from my 2.4L to my 455 TA that I use to have. Besides Autozone that Brim mentioned, it can be found in most parts stores and in WalMart.
I always used Mobil 1 5W-30 not fully synthetic tho. Fully synthetic is not to friendly with the oil seals. And I tried Motul before once. It's pretty good stuff but hard to find. What makes you think your engine needs internal cleaning?
marvel is in the same product group as seafoam (no not the same) also marvel can be used in alchol to add the petroleum that way race cars can run striaght alchol
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. I only once used a fuel injector cleaner and it made it a little better but in the end I had to replace it anyway.
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