No, it doesn't "bugger up" anything. It means you won't get the full benefit of
synthetic's durability, but the mix is still more robust than straight dino oil.
One would assume that after an episode such as the OP describes, he'd be heading
for an oil change sooner than usual anyway.
My understanding is that the longevity is compromised. (One of) the point/s
of synthetic is great heat stability over a long period of time, whereas
regular oil degrades more quickly. Thus any regular oil present in
synthetic will burn up sooner, affecting the properties of the mix... Of
course, as long as that is taken into account it is no problem for an
engine, just as regular oil will work fine.
For direct contact replace nospam with schmetterling
I have never seen regular oil burn up in any engine so topping up is hardly
likely to have any detectable effect.
There are many high end mineral oils that are rated for longer and heavier
duty than, for example, Mobil1 10w/30. Mind you, the 0w/40 viscosity of M1
is in a different and higher league not matched in any way by any mineral
oil and only one semi-synthetic that I know of. The viscosity is incidental
to the properties of those M1 oils. They have different chemistry and meet
different performance standards.
You tell me.
The only thing that is really important is that any oil meets or exceeds the
STANDARD required by the manufacturer for an application which has a
specified servicing regime.
You probably know that modern BMW engines fitted to BMW cars are required to
use oil meeting certain specific BMW standards. What you may not know is
that those same engines running the same service schedule [flexible and
generally around 15000 miles] in non BMW applications can run on any oil
meeting ACEA A3 for petrol or A3 and B3 for diesel and from 5w/30 to 10w/40
viscosity above -10C ambient. The interesting thing is that Mobil1 in some
of those viscosity grades will not meet those standards while, what are
considered to be, lesser oils will do.
So you see it is not as simple as saying synthetic lasts longer. The base
oil type is often not the limiting factor, or at least it is not that
Mineral oil is perfectly capable of withstanding Turbo temperatures. Oils
meeting MB228.3 and ACEA E3 long drain specification for the heaviest duty
use at extended drain intervals in highly stressed turbocharged engines are
predominantly mineral based.
Yes there is a much higher specification again for use up to 100,000 or more
miles with by-pass filtration which can only be met using at least a
semi-synthetic or fully synthetic base oil but this is a very extreme
specification at the cutting edge of extreme duty lubrication.
Again I have to stress that the performance 'standard' met by an oil is what
is important, not the base oil. 'Synthetic' as a buzz word captures the
imagination and is simple to get across if one is marketing to achieve a
premium price in a crowded market.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.