When I first bought my car it was from an old couple that were the original owner, they always had it serviced by the dealer they bought it from. When I bought it from them it had 50,000 miles on it. I swithed the motor oil to penzoil from I think it was mobil 1. Would making a swith effect the life or performance of the engine

 

If it was Mobil 1 synthetic I'd say the switch wasn't for the best, but just keep the oil changed every 3k and you should be fine.

 

Just my opinion, but if you want to keep the car in the same prisine condition you bought it, switch back to Mobil 1 or Amsoil as soon as you get done reading this...10W30 would be great - there is no need to use 5W-anything with synthetics. We'll see if anyone else has the same opinion.

(I can't see why anyone would go backward after the car has been so well maintained for the first 50,000 miles ¿? )

 

it wasn't synthetic just regular Mobil 5w 30, made the switch to Pennzoil same weight. I always change it around 2,500-3,000 miles. I know I said Mobil 1 that was my mistake.

 

Grafx,

Gotcha. That's a little different situation. The brand doesn't make a lot of difference - with a couple of exceptions. Quaker State / Pennzoil (same company) is probably one of the lowest quality oils you can get with a name brand on it. Unless you're getting it for free, I'd look for something else. Castrol, Mobil, Marvel,

It's never to late to commit to syn, either. You just can't beat those engineered polymers.

 

Isn't it called Mobil 1 though, and then the synthetic one is Mobil 1 Synethetic, cause I thought one time I went to buy Mobil 1 and it didn't say sythetic on it but another one did. Not sure.

 

Mobil 1 is synthetic, Mobil 0 is regular oil. While I am here I have to agree about Pennzoil, I wouldn't run it in my neighbors weedeater.

 

Are you guys serious, I've always used Pennzoil I had no idea it was crap. I guess I should switch if everyone is saying the same thing about it. Also is synthetic mainly for newer engines or is it alright to run it with old motors also is there some sort of cut off point where you shouldn't run synthetic? Which brand motor oil do you guys recommend the most?

 

If you have oil leaks, it's probably not the best idea to use synthetic cause it will become worse.

 

Do not use synthetic:
1) To run in a new flat-tappet cam.
2) To break in a rebuilt engine (factory new engines, no problem).
3) If the engine has a substantial amount of dino juice sludge that, if loosened, would plug the oil pump pickup screen.

If it leaks, fix it (or ignore it - it's your driveway). If it doesn't leak, it's less likely to start leaking with synthetic.

Another general rule of thumb: If it's got Pennzoil in it, change it...NOW!

 

Woops! I think I got Pennzoil in it . My bro at his place has Pennzoil, and its Certified Chevy place. While my bro in law, works at Sunoco, and uses Valvoline. What is the best "normal" oil to use, meaning crude or whatever, not synthetic.

 

I've heard that with older engines it's easier for the synthetic oil to pass by the piston rings

 

Seriously I hate Pennzoil and wouldn't use it, but when G.M., Ford, and Chrysler did there oil test a few years back it was pretty high on the list as were Valvoline and Quaker State. I'm sure if you look you can find the results of their tests, I can't find my sheet. Mobil 1 was the best and the other were close behind. The only serious problem is using 10w-40w as it didn't pass any of the big threes test and G.M. was losing quite a few cranks to this weight of oil for some reason. The problem most people get with Pennzoil is that is contains parifin wax and if it isn't changed regularly it will sludge whereas Valvoline and others will not.

 

I'm currently running regular 5w30, if I switch to a synthetic should I change the weight to 10w30 or leave it the same??

 

So if I buy the '89 Formula I've been looking at, should I change to synthetic to help a 103k mile engine age gracefully, or do I say the hell with it and just keep changing it with dino stuff every 3k? Keep in mind, I get a little blue smoke on startups, and the amount of oil it will leak overnight amounts to the size of a pinhead...

I mean, this car is used to the 3,500-9k oil change intervals the former owner gave it, and it runs like a top

 

i am using moble1 synth 15w-50 in my Camaro with 130,000 miles of dino on it, just to help reduce the amount of blue smoke comng out. NO leaks and the inside of the engine is clean, looks like the guy eaither used **** oil with a flush every now and then or had the heads pulled and something done so they are clean now.....

 

I think people take this oil thing waaay too seriously. I figure the bottom line here is:

1. If my car burns (or leaks) more than a quart between oil changes, it gets dino juice - no,no,no...doesn't matter too much on brand. just one of the major ones should do fine - change oil & filter every 3,000 give or take a few hundred. You'll have no problems.

2. No leakage, and doesn't seem to burn oil - AND- you plan on keeping her for awhile.. then go with synthetic and change it every 5-6K miles. Oh, BTW - if you plan on selling it soon...refer to #1.



Oh BTW....There's no need to get really choosey about fully synthetic brands. The difference between them are little. I've sat through a couple classes at work given by Mobil reps, and that's what they also say.

 

Rrrriiiiiggggghhhhhhtttttt....

 

both of you care to back your selfs up with cold hard facts?? I tend not to believe either of you...LOL 25 thousand or 1 year on the oil...i say BS, but that is me, and there is no difference, i say BS too b/c then you would see Castrol Syntec talkn about other full synthetic brands in their commercials, not just conventional oils.....make sense...gotta love my last min. typing.....


Oh i run 10w30 GTX in the summer
5w-30 GTX in the fall/spring
0w-30 in the dead winter
ON THE GOOD CAR
the convert gets 15w-50 moble 1 to help reduce VISABLE smoke....LOL stays in there for like untill july becuase i just don't give a FOCK about the that engine, only need like 7,000 more miles otta of it...LOL

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