Dino oil to Mobil 1

targa911S · 03-31-2005, 11:31 AM

If I change from dino oil to mobil 1 ...does the engine have to be flushed? Not for my 911 but for my Nissan.

RoninLB · 03-31-2005, 11:37 AM

I'd search LubeMaster77 and Mobil 1 for what he says.

RickM · RickM's Garage

No it's doesn't have to be flushed. They can co-exist. By the second oil change it'll all be Mobil.

kaisen · 03-31-2005, 11:44 AM

I've been using Mobil 1 for years in my daily drivers and I've been VERY happy. No need to flush, and I wouldn't.

targa911S · 03-31-2005, 11:47 AM

Thanks guys. I knew I could get the right stuff from my buds.

beepbeep · 03-31-2005, 12:39 PM

No probs, they mix. Make sure you get right viscosity and that you don't have any obvious leaks.

RickM · RickM's Garage

Right from the Mobil 1 site:

Myth: I need to flush my engine before switching to Mobil 1.

Reality: No special preparation is necessary when switching from conventional motor oil to Mobil 1 or Mobil 1 Extended Performance.

kach22i · kach22i's Garage

Synthetics are evil........unless you have just had a complete reseal job, or your car is less than six years old.

Joeaksa · 03-31-2005, 01:20 PM

Have used them for 30 years on various types of engines with NO problems, evil or not. In an aircooled car if you drive where it gets over 100 in the summer you are just asking for problems if you do not have syn oil in the engine.

BTW, all the jet engines flying around the world are using syn oils, so they work very well.

Joe A

RickM · RickM's Garage

Quote:

Originally posted by kach22i
unless you have just had a complete reseal job, or your car is less than six years old.

Sorry but that's bull.

kach22i · kach22i's Garage

Quote:

Originally posted by RickM
Sorry but that's bull.

There are a bunch of threads on this topic in the 911 section as you know. I'll bet there is a 50/50 split on this subject. I'm not saying synthetics "cause" leaks - they just can make problems way more obvious and urgent.

What ever became of that Lycoming lawsuit?
http://www.eaa49.av.org/techart/mobil01.htm

Joeaksa · 03-31-2005, 02:32 PM

Bought a 1972 911 in Germany 15 years ago, switched it to syn oil. It had been running dino oil for 25 years. Not one leak...

Bought a 1981 911, also in Germany 12 years ago for the wife. Switched it to syn oil and again no leaks...

Bought a 1985 911, in Dallas in 1997. Switched it to syn oil after running dino oil for over 10 years and once again no leaks. Engine is still running syn oil and not leaking.

Do we see any trends here???

Mobil aviation syn suit was settled 10 years ago. Different oil an different application and engine type. Was a problem with the oil and sludge in the propellor hub as well as other areas. 911's (with few exceptions) do not have propellor hubs.

http://www.avweb.com/news/news/182892-1.html

If you search long enough you can find someone to agree with any point you wish to make. Personally I have over 30 years with syn oils and like them. I have trusted my life with them and will continue to do so...

JoeA

M.D. Holloway · 03-31-2005, 02:59 PM

First off, do you think you should flush do to compatibility issues of mineral oils vs synthetics? It is true that you do leave behind some old oil upon change out. The % left behind will not adversely affect the new. In a perfect world, you would have it drained completely then add, but thats not happening.

Mixing the oil technology won't really hurt you - many companies do it now, they are called semi-sythetics, synthetic blends and para synthetic engine oils.

As far as flushing to get out contaminants, PM me your shipping address and I will send you a flushing oil that you can add directly to your crank/sump, drive around a bit than drain. I promise it won't mess up your engine and it will safely get rid of any depsits that have built up on the rings and bearings. Again, I promise it won't moneky up your workx!

(Targa911S - you make me sad, you should have PMd me on this)

ed martin · 03-31-2005, 07:24 PM

I had a 73 targa with a very minor leak. Switched to synthetic and soon after developed multiple leaks, esp. from flywheel seal area. It was gradual until after a thirty mile run I lost five quarts of oil. Had to change the clutch (oil soaked) and of course the flywheel seal. Changed back to dino and never looked back. In addition I left 3/4 of a quart of synthetic in my glove box with the cap tightly screwed on- leaked every where. See a trend?

As stated you can look long enough to find a story to support your point, but personally I would never put sythetic in an older car.

Don Ro · 03-31-2005, 09:06 PM

I'm with a few moto forums/groups/lists. We sometimes hear of leaks appearing after switching to syn.
I switched to Mobil 1 V-Twin 20W-50 syn. in my Ducati 996S a 1,000 miles ago/last summer...no leaks yet.
Ran syn. in a few turbo cars - no leaks. It happens, but not so far w/me.
.
Drained 'n changed - never flushed.

targa911S · 04-01-2005, 05:03 AM

Lube ...sorry I didn't know you truely were the lube master. I knows different now. Don't be sad.

Joeaksa · 04-01-2005, 06:32 AM

Lube,

We thougth it was a sexual thing... like getting the ladies all hot and bothered... well, never mind...

JoeA

targa911S · 04-01-2005, 07:16 AM

Yeah ...I'm with Joe. I thought it was a sexual thing. God I have a dirty mind!

M.D. Holloway · 04-01-2005, 12:04 PM

You should see the looks that my wife has gotten (and me) when she tells here girl friends that her husband is a "Lubricant Expert".

Joeaksa · 04-01-2005, 04:49 PM

Targa,

You (both of us) have a good mind!

Mike,

Nothing wrong with keeping people guessing!

JoeA