Any old oil Any old oil any any any old O-I-L
hope you all enjoy a sing song :D
Coming up for another oil change can i put any old oil in my G? i know my engine is different so was wondering if i'd need to put synthetic in, the only reason i suddenly have a bit of doubt is because of a bloke who drinks in my local reckons thats what i should be putting in, and then another "expert" chipped in with "nahhh it'd be too thin mate" i've only got 3 quid in my pocket and need to know who to buy the drink for...... :?
Cheers
There are far too many myths about synthetic oil and oil in general. 5w40 for example is only 5 when cold and 40 when hot but the thin cold weight will be better for protection at a cold start, so too thin is not really an issue.
Mercedes have revised their recommendations for oil see http://www.benzworld.org/forums/forums/thread-view.asp?tid=1215090&posts...
The man reason for using a good synthetic, and they are not cheap, is the fact that the film strength is 6 times greater so protection against metal on metal is vastly superior. The stories that they cause seal shrinkage and oil leaks is a thing of the past – modern synthetic a perfectly ok.
Try talking to the tech department here http://www.opieoils.co.uk/lubricants.htm they seem to know whats what. In addition using a fully synthetic oil in the diffs and tc is a good idea. Its expensive but I believe worth it in the long run.
also morris's oil of shrewsbury, very good oils with a good technical dept.
5w40 for example is only 5 when cold and 40 when hot but the thin cold weight will be better for protection at a cold start, so too thin is not really an issue.
The only comment I would make, no expert here just basing this on my own experience, is that older engines will have been built with tolerances designed around say 15w50. Hence when I put synthetic 5w/30 in a 1992 car the cams / hydralic valves rattled when cold. Once warm I guess the tolerances sorted them selves out and even though the oil was thin it ran OK.
In the end I went for 5K mile oil changes using a high spec semi synth. 15w/40.
Now have a petrol turbo though and would not use anything other than fully synth. due to high temps. generated around turbo bearings.
The only comment I would make, no expert here just basing this on my own experience, is that older engines will have been built with tolerances designed around say 15w50. Hence when I put synthetic 5w/30 in a 1992 car the cams / hydralic valves rattled when cold. Once warm I guess the tolerances sorted them selves out and even though the oil was thin it ran OK.
I guess your right - Some oils - like Mobil 1 are noisy - or seem to be. My tappets (VW engine) sounded like a weaving shed on Mobil 0W40 but Synta 5W40 was very quiet.
Mercedes claim that 0W30 is fine between -25 to +30 C for the 460 class but I would be happier with 5W40 or 10W40.
The key point with synthetics is film stength - 6 times greater then mineral oil. It has to be better protection from wear.
I used to use semi-synthetic but have changed to high quality synthetic as it is very difficult know what the synthetic content is as there are no standards and semi seems to be a nice marketing ploy to charge more for oil. Just an opinion..
used to use semi-synthetic but have changed to high quality synthetic as it is very difficult know what the synthetic content is as there are no standards and semi seems to be a nice marketing ploy to charge more for oil. Just an opinion..
I would need to do some research on this but the SAE rating gives you an indication of an oils performance.
Once had a ride in A BMW 3 series that Mobil used as an advert for Mobil 1. It had done 1 million miles plus on the original engine. Obviously not too many cold starts involved to do that sort of mileage though! Engine sounded fine but rest of it creaked a little :cry:
Mobil 1 does seem over hyped though, way too pricey compared to other synthetics with same SAE rating.
Wonder who makes Synta? and other car manufacturer branded oils?
Whats wrong with Tractor oil, farmers being tight buggers its always better value for money , spec for spec, try CASE No 1, tweaked TDI Galaxy has thrived on it with no problems -- but seeing as nearly modern tractors are using turbos -- and run hard & hot, that should be no surprise.
Marcus
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