HEy Guys i Got my 03 Max from an auction July 2009 with 101,700 miles. I did an oil change in October 09 with Castrol High Mileage. I'm due for a change this month. Can i Change to Mobil 1 synthetic? Or stick to the high mileage Oil?? And would there be any problems in the engine and performance if I change to Mobil 1 synthetic because i used Catrol High Mileage previously?

 

I dont see why you cant.

 

Does the engine consume oil at all? If not, then I would stick with Castrol High Mileage.

 

Are you using 3 months as basis for changing? Go by mileage. 5K on dino oil, 8K for synthetic oil. Unless you want to dump money. Be friendly with the environment...

 

Mobil! and you are good to go........

 

Switch to Synthetic.

 

Thanks Guys I appreciate it. I really havent notice any Oil burning. But i will check on that. Any symptoms of Oil Burning i Should notice?

 

Pull the dipstick out and if it is low, there you go.

 

i run Mobil 1 full synthetic never had a problem with it.. nd i have a slight oil burning problem

 

I am flushing my Max, using dino oil for 2 short oil changes and then I switch to QS Ultimate Synthetic.

 

You shouldn't have an issue switching from High Mileage oil to Synthetic, but they say it's not good to switch back.

I like the Castrol Syntec 10w30 Synthetic, with the K&N Filter. I change mine every 4500 to 5000 miles (Probably throwing money away on it, but it makes me feel better about myself ).

 

That's what counts!!!

 

mobil1 is the way to go

 

synthetic.

 

I thought you might have a oil leaking problem switching to synthetic with high miles.That is what I have read.

 

Yeah i my engine loves that QS

 

ROYAL PURPLE 5-30W FTW!!

 

just finished my 47th oil change with M1 Synth 10W30....and just passed 200K last week. Incidently, I get the same 20 mpg that I got the day i drove it off the lot. Love my max.

 

 

typical changing from a high mileage to a full synthetic is fine. but it is not recommended to down grade as in going from a full syn to a conventional oil.

 

AMSOIL
25k or one year between changes which ever comes first.

 

 

depends on what kind of driving you do, if u do alot of stop and go driving, better of with the synthetic oil, if not it doesnt hurt to use conventional oil but i personal use the synthetic b/c i dont have to change the oil as often and its better over all. just my 2 cents

 

Synthetic is the wave of the future. Either follow a regimen of 8~10K mile change or look at your oil, if it is getting dark, time to change. You will see it change color around 8K. That means it has picking up dirt.

But yes, switch over to SYN.

 

I was wondering which weight would be better? 5-30w that is recommended or 10-30w? I'm just now getting to 69000 miles

 

Based on my experience, the only problem you will have is the cleaning agents in synthetics removing build-up that has help seal potential leaks. Some cars experience temporary oil leakage due to this removal of the natural "helping" build-up. Eventually, as long as your seals are adequete, the synthetic will re-invigorate the seals and you're good to go. This is an average experience.
Worst case: switching will reveal seal problems which will need attention. Best case: you'll experience no noticable affects.

BTW: Who Dat?!?! Geaux Saints!

 

I switched to synthetic @ 67k and have done 2 oil changes since. No leaks, no problems. I stick to the factory maintenance intervals just because I like clean oil in the crankcase and the filters are so damned small. I always look for sales and stock up on Castrol Syntec.

 

Say WHAT? Synthetic does not do anything to the seals. In fact, synthetic does not cause seal sweal like most conventional oils. It will not mysteriously make a leak go away.

As you correctly noted, it will clean away the crap that might have been hiding a leak but it wont make it go away over time. If switch between conventional oil and synthetic causes a leak, it means that you need to repair something or live with the leak.

 

It is no mystery.
In some cases, switching to
synthetic oil will clean sludge away that could reveal seal deficiencies.
Due to the molecular structure of synthetics and their bonding/adhering qualities, these "leaks" can be reduced because of the nature of the oil.

Synthetic oils are not a cure and as I stated before, these "leaks" more than likely point to a problem in need of attention.

 

That I will buy.

No way. I need a paper or a url or something that backs that up. I have never seen that stated and I spend a heck of a lot of time on BITOG.

 

german castrol 0w30 for the win.

 

Trying to find it FTL.

For all the Royal Purple leg humpers, note it shears easily in as little as 5000 miles seen in oil tests.

You are better off using Pennzoil Platinum 5W-30 or Mobil 5W-40 1 synthetic since VQs love heavier weight oil. German Castrol is heavy enough to almost be classified as a 40 weight.

Otherwise GC 0W-30 >*, followed by Amsoil.

 

i work in an oil change shop (no name ffor legal reasons), switching oils at that mileage CAN CAUSE LEAKS. high mileage oils and synthetics have additives which lubricate seals however a sudden change can damage them, ie. changing at high mileage.
if u regularly change your oil (every 5k) then the change shouldnt effect it. and syn oil doesnt restore seals.

 

Yes, if you switch to syn it can cause leaks by revealing a problem with seal that has been covered up by conventional oil. The syn itself IS NOT causing the leak nor will it make the leak go away.

High mileage oils have additives to replicate the seal swealling characteristics that conventional can cause. Again; Its a STOP GAP measure. If you have a leak and use syn it means YOU HAVE A PROBLEM and need to fix it.

You will not see catastrophic failure of a motor due to switching of motor oils unless the engine was never taken care of.

 

But what I stated way above switching can cause a leak that may not have developed if you did not make the switch to synthetic.

 

And that would be a failure of a seal that would go sometime. Find it and fix it or put your head in the sand and hope one doesnt exist.

Its not causing a leak. Its revealing a leak, and existing problem that is being covered up by poor maint or inferior parts. Synthetic does not cause leaks.

 

Thats bull it very likly will never leak if you didn"t make the switch.Do a search it should not be hard to find the info. I have nothing against synthetic I think it is great stuff but it is pretty well know by people in the business that it can cause leaking in high milage cars that would not have leaked without the switch.

 

http://forums.gmhightechperformance....eak/index.html Here is one unbiased example but if you read what Moble or the other oil dealer's say you are not getting the truth, They want to sell you oil.There are a ton more but don't listen to what the oil co's say about the oil they want to sell you.

 

Eneos 0w-50. Enough said, this is a real synthetic oil. Engine runs noticeably quieter. Its insane.

 

auto zone, wally's world, I never have a problem finding it in Canada or the US.