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Author Topic: Does synth oil tend to leak out of old motors.  (Read 3583 times)

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TheBoy

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Re: Does synth oil tend to leak out of old motors.
« Reply #15 on: 23 May 2007, 13:14:42 »
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Mine's on Fully Synthetic, does not leak & gets changed every 10K
Has done 128K now & the only problem in 4 years of ownership was the overheating which now appears to have been remedied
IW
The inteval on the BMW 2.5TD engine is 4.5k MAXIMUM  :o.
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osealy

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Re: Does synth oil tend to leak out of old motors.
« Reply #16 on: 23 May 2007, 14:19:44 »
I figured it OK to stretch it to 5k as most of my driving is rural A roads.
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Pitchfork

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Re: Does synth oil tend to leak out of old motors.
« Reply #17 on: 23 May 2007, 19:33:05 »
But surely, fully synthetic oil is far nore stable & robust that mineral or semi-synth (it should be for the cost) therefore last longer?
Any specialist chemists out there care to comment?
IW
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Omegatoy

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Re: Does synth oil tend to leak out of old motors.
« Reply #18 on: 23 May 2007, 19:54:00 »
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But surely, fully synthetic oil is far nore stable & robust that mineral or semi-synth (it should be for the cost) therefore last longer?
Any specialist chemists out there care to comment?
IW


know what your thinking but, on a diesel its not how slippery the oil is although that does come into it,, its how much soot and crap the oil can hold in suspension!! thats why a diesel oil turns black so quickly cos the diesel unlike a petrol makes particules of soot and stuff that is held in the oil till its changed, ergo if you leave the oil change to long you actually have a nice grinding paste in there\ :-*!!!

thats why quite a few TD engines have let a rod go through the side of the block cos the oil wasnt lubricating but actually wearing !!! 4500 is the max time you can leave it before changing according to bmw!!!!
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osealy

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Re: Does synth oil tend to leak out of old motors.
« Reply #19 on: 23 May 2007, 21:12:04 »
Omegatoy

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Drives:Omega TD chipped of course
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Is it a manual ? What about the german chips on ebay £60.
What mpg
All My auto est's have done 34ish
Computers have said
38,   57,   28, So don't believe em.
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Pitchfork

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Re: Does synth oil tend to leak out of old motors.
« Reply #20 on: 24 May 2007, 07:48:11 »
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Quote
But surely, fully synthetic oil is far nore stable & robust that mineral or semi-synth (it should be for the cost) therefore last longer?
Any specialist chemists out there care to comment?
IW


know what your thinking but, on a diesel its not how slippery the oil is although that does come into it,, its how much soot and crap the oil can hold in suspension!! thats why a diesel oil turns black so quickly cos the diesel unlike a petrol makes particules of soot and stuff that is held in the oil till its changed, ergo if you leave the oil change to long you actually have a nice grinding paste in there\ :-*!!!

thats why quite a few TD engines have let a rod go through the side of the block cos the oil wasnt lubricating but actually wearing !!! 4500 is the max time you can leave it before changing according to bmw!!!!

Then that suggests that there is no advantage in using synthetic oils (or even semi-synth) in a Diesel if it's going to be thrown so frequently & we may as well use the cheapest mineral type that we can find -doesn't it?
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TheBoy

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Re: Does synth oil tend to leak out of old motors.
« Reply #21 on: 24 May 2007, 08:36:32 »
Quote
Quote
Quote
But surely, fully synthetic oil is far nore stable & robust that mineral or semi-synth (it should be for the cost) therefore last longer?
Any specialist chemists out there care to comment?
IW


know what your thinking but, on a diesel its not how slippery the oil is although that does come into it,, its how much soot and crap the oil can hold in suspension!! thats why a diesel oil turns black so quickly cos the diesel unlike a petrol makes particules of soot and stuff that is held in the oil till its changed, ergo if you leave the oil change to long you actually have a nice grinding paste in there\ :-*!!!

thats why quite a few TD engines have let a rod go through the side of the block cos the oil wasnt lubricating but actually wearing !!! 4500 is the max time you can leave it before changing according to bmw!!!!

Then that suggests that there is no advantage in using synthetic oils (or even semi-synth) in a Diesel if it's going to be thrown so frequently & we may as well use the cheapest mineral type that we can find -doesn't it?
A mineral oil is no good for modern engines.

BMW state 4.5k, and specify semi.  Remember, this is the MAXIMUM mileage, and the MINIMUM oil spec. As Omegatoy has said, oil in diesels is used as a cleaner, and hence why diesel oil changes are more frequent than their petrol counterparts.

Using fully synth does not magically extend this service interval, although the oil won't break down as quick (though when it does start to break down, will do so quickly).

Additionally, nobody produces an automotive oil that lasts beyond about 7k (this info now 3yrs old, so may be improvements now), stated service intervals longer than this are based on a ratio of marketing and acceptable accelerated wear.  Remember, manufacturers like to stretch the interval as long as possible, hence you hear Vx cry out 20k oil changes. Poppycock.

I would recommend you stick to a maximum of what BMW state, ideally much less. No point using expensive fully synth, stick to what BMW recommend, ie semi. Not that much more expensive than mineral on TC ;)
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Omegatoy

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Re: Does synth oil tend to leak out of old motors.
« Reply #22 on: 24 May 2007, 20:20:18 »
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Omegatoy

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Posts: 339
Drives:Omega TD chipped of course
Loc:Oxfordshire  



Is it a manual ? What about the german chips on ebay £60.
What mpg
All My auto est's have done 34ish
Computers have said
38,   57,   28, So don't believe em.

Got a manual and an auto ;D manual averages about 45 with the chip if i drive it reasoably(unger 90) if im hooning it everywhere drops to about 35/36,
Auto is only used for short journey by swmbo unless i take if anywhere, and averages about 33 on short journeys sby her and 34ish on longer journey only done one journey of 120 miles tho and thats what it worked out to!!
German chips i dodnt know about mate, cos i use our own!!
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