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View Full Version : Thinking of going from non-synthetic to full synthetic...


BennyL
04-24-2006, 04:49 PM
Hey guys,

I figured I should ask here, since you all drive bimmers, and you all have experience!

So I have a 96 318 Cabriolet (M44)

Since I bought the car, I've done 2 oil changes. Both times with Castrol GTX 10W30 non-synthetic oil.

I'm thinking of switching to Mobil 1 full synthetic 10W30 (especially cuz its on sale at partsource for $29.99 for the 4.4L jug)

So... what do you guys say? Is there anything I need to worry about? Is it safe to make the switch? Do you think its a good idea?

Thanks!

Justin e36
04-24-2006, 05:39 PM
Is there anything I need to worry about?
no.

Is it safe to make the switch?
yes.

Do you think its a good idea?
yes.

RMPMOTORS
04-24-2006, 11:03 PM
Many times switching at a high milage will cause some leaks to happen, seen it many times.


ROcco

Proliphic
04-25-2006, 09:34 AM
Rocco I rememebr whan I got an oil change at your shop you mentioned something about this to me..

What would be some things I should look for when changing to full synthetic @ 187,000 KM ??? im thinking of switching but not if its gonna cost alot to fix all the leaks that pop up..

Pro.

dtthiaga
04-25-2006, 09:56 AM
At 187,000KM, I wouldn't switch to synthetic. Just use a good quality oil, and frequent oil changes (with a good filter) and you'll be fine.

I've seen cars first hand, that after 150,000KM or so, when switched to synthetic they start loosing oil. Going back to a good regular oil solved the problem.

If a car had less than 60,000KM, and regular oil was used, I would probably switch to synthetic. More KM than that, I would just keep up with the regular oil.

Take a look at this post from a while back...

http://www.maxbimmer.com/forums/showthread.php?t=16964&highlight=synthetic

M3ti Compact
04-25-2006, 10:57 AM
Synthetic doesn't cause the leaks, it'd leak easier through leaks that were already there to begin with.

Mystikal
04-25-2006, 11:27 AM
Synthetic doesn't cause the leaks, it'd leak easier through leaks that were already there to begin with.

Precisely.

Switching to synthetic brings attention to already poor condition seals. It's up to you if you'd rather pretend they're not there and continue with non-synthetic.

I switched at 299k and had no issues.

BennyL
04-25-2006, 12:04 PM
man, i hate getting mixed replies!

so - if i do switch to synthetic, and i do start getting leaks...

where are theses leaks going to occur from? inside the engine, outside? where?

and how are these leaks fixed?

thanks!

dtthiaga
04-25-2006, 12:09 PM
Engines are wear and tear items. As soon as you put more than 20K on the motor, it is not going to be "like new". Itís just not practical to rebuild the motor every 100,000KM so you have no leaks, and like new compression etc.

I've heard many many mechanics not recommending the switching to Synthetic oil past 80,000-100,000 KM. Just use a good oil and youíll be fine; doing it after the first oil change or two is fine/good to do.

But, you canít deny the fact, that some cars running regular oil upto 150,000KM, and then switching to Synthetic causes oil consumption. Going back to regular oil stops the problem. I too have read the ďmisnomers of synthetic oilsĒ as well. Iíve seen it first hand. Tried to use Synthetic after 140,000KM, and noticed slight oil consumption. Returned back to regular good quality oil and everything was fine. Even at 210,000KM, the car was running very strong, not consuming any noticeable oil. The valve seals we not leaking, no blue smoke on startup or under hard acceleration.

All Iím trying to say is, heads up if you switch to Synthetic oil. Check the oil level very frequently if you do it this late in the engine life.

RMPMOTORS
04-25-2006, 12:48 PM
Its my personal opion not to change at high k, a rear main seal is an expensive item to replace when it starts to leak, the seal may not leak now may leak when swithing to synthetic.

Just change your oil more often with regualar good brand oil and you will be fine.

The final decision is up to you.

Rocco

BennyL
04-25-2006, 02:26 PM
Damn it!

Now I'm scared to make the switch.

My engine has about 170,000 KM on it... would you consider that too high to get experimental?

And if I do stick with regular non-synthetic, what is the best for my engine? Should I stick with Castrol GTX?

propr'one
04-25-2006, 02:43 PM
most people stick with mobil 1 synthetic. Ask rocco to be sure, but i dont think flip flopping between synthetic and mineral is a good idea. My car's been on synthetic for a while, and I'm pretty sure it finally stopped leaking oil after the last few services. Its really a personal desision you should make based on how long you want to keep the car, etc

BigD
04-25-2006, 06:58 PM
Many times switching at a high milage will cause some leaks to happen, seen it many times.


ROcco

I bet the synthetic had lower viscosity. I know Randy had a serious crank seal leak on his Subaru, and it went away completely by switching from 5w50 to 10w30 mobil1. I've seen this too. People stick to 10w30 dino and when they switch to synthetic they get drawn to the more exotic 5w40 and 5w50 brews and discover leaks they never knew they had.

BennyL
04-25-2006, 11:18 PM
**** man, I really wanna go to Mobil 1 10W30. its the same viscosity I'm using in dino fluid now!

superman123
04-25-2006, 11:26 PM
GO with luqui moly (lubro moly) 5w-30 they also have a full synthetic
and racing oil
http://www.hopefungautoparts.com/LubroMoly.htm

mmmm...100 bucks for motor oil*par-t*

superman123
04-25-2006, 11:28 PM
GO with luqui moly (lubro moly) 5w-40 they also have a full synthetic
and racing oil
http://www.hopefungautoparts.com/LubroMoly.htm

mmmm...100 bucks for motor oil*par-t*

ZiMMie
04-25-2006, 11:30 PM
**** man, I really wanna go to Mobil 1 10W30. its the same viscosity I'm using in dino fluid now!
the sale its up for another 5 days :D.

propr'one
04-25-2006, 11:57 PM
superman i have 5w30 lubro moly in the car now. luv it:D

superman123
04-26-2006, 12:08 AM
yeah i heard allot about it ...im gonne run that in all my cars from now on*th-up*
i might go with their additives aswell

superman123
04-26-2006, 12:09 AM
propr'one ...how long before u do a oil change ?

BigD
04-26-2006, 03:20 PM
**** man, I really wanna go to Mobil 1 10W30. its the same viscosity I'm using in dino fluid now!

Do it, your motor will thank you.

BennyL
04-26-2006, 03:38 PM
I've decided I'm going to do it. Only question is: how do I know if any seals are leaking after I make the switch?

I mean... I obviously make sure there is no oil dripping under my car ever. But if it is some sort of internal seal leak, how do I know about it?

Mystikal
04-26-2006, 03:41 PM
I've decided I'm going to do it. Only question is: how do I know if any seals are leaking after I make the switch?

I mean... I obviously make sure there is no oil dripping under my car ever. But if it is some sort of internal seal leak, how do I know about it?

It'll either be in your coolant or outside the car. Either way the oil level will deplete, obviously.