Here is an extreme example of what I mean. Let's say I had oil in the engine and it was half empty. I think it would be OK to fill up the missing half with, say, From what I have read the result would be I can imagine that some of the very extreme numbers may not mix too well? Is that right? However, as I am unlikely to come across some of the industry's more exotic oils at the average motor factors or garage, I guess I cannot worry about that too much?
In theory, you could mix a fully synthetic 0W with a mineral 20W if we look at the extremes and you'd end up with something like a 10W semi synthetic - although we wouldn't really recommend you do this , but in theory it would be fine.
E Am I right in thinking that: i All motor oils mineral, semi-synthetic and fully synthetic all start from the same crude oil base? Yes, although Ester based synthetics are derived from mixing alcohols and acids - these are used as additives, and base oils in some high end synthetics, but most fully synthetic oils on the market will be PAO which are derived from mineral crude, which is why you can mix them motor oils generally available that is with no adverse effects.
Sometimes, depends on the specification the oil needs to meet, but synthetic oils are tailored to do a more specific job so the additive package can be tailored to meet specific needs which could mean more additives are needed. To me it implies it is fully artificial, suggesting it was made entirely in a laboratory, not from crude oil, then tweaked with man-made additives in the final process.
It depends - fully synthetics tend to be classed as lubricating fluids made by chemically reacting materials of a specific chemical composition to produce a compound with planned and predictable properties. Yes - that is basically correct. F If my motorcycle needed oil, I think is it OK to mix: Yes, shouldn't be a problem although we would recommend trying to stick with the manufacturers recommendations where possible as this will give the best performance and protection for your engine.
I have no great desire to try just for the sake of it. I simply need to know that it would be OK. Yes to all three above - although adding mineral to a synthetic will compromise the benefits, and may reduce the specification below that which is required for the vehicle, especially if a fully synthetic oil is required G Am I right in thinking that it is OK to mix oil from any of the recognised decent manufacturers? Castrol with Valvoline or Esso with Morris, for instance.
Yes, if the oil is the same spec then no problem - if different spec then rules above apply - obviously, sticking with one brand is preferred, that way you are sure the additive package is not compromised by any slight differences between manufacturers.
H Whilst I think I understand the above, I am still confused by the other letters that seem to appear on the can. Do you have an idiot's guide? I Am I right in thinking that motorcycles with wet clutches should not be run on oils specifically designed for cars, as the oil may be too slippery, leading to clutch slip? You should check your oil levels regularly and top it up when needed, it should also be changed regularly - as often as every year. If you need some help, supply a few details and our oil finder tool will select the right oil for your car.
A DIY oil change is a pretty simple job for the home mechanic. If you do choose to do it yourself, make sure to capture the used oil4 and dispose of it safely. Enter your registration number and we'll only show you appropriate products.
Please enable cookies in your web browser to improve your shopping experience. Your browser's JavaScript functionality is turned off. I stand to be corrected just this once, though Tue 5 Feb Re: Halfords oil - Pat. I used Halfords fully synthetic last time I serviced my Merc, which has , on the clock. Service records up to , show Castrol semi-synthetic and that's what I've used since, but at , miles I used the Halfords stuff because it was slightly cheaper than Castrol Magnatec.
As soon as I poured it into the engine I was impressed with how pale in colour and light in texture it was. And I'm convinced that the engine seemed even smoother and slightly more powerful than before.
I'd certainly use it again now needs its , service - overdue! It still looks god on the dipstick. Pat Reply Report as offensive Link. Tue 5 Feb Re: Halfords oil - Dave. This is 10W40 I take it? Tue 5 Feb Re: Oil prices. Try Granville synthetic very cheap and you can get it from good trade based motorfactors. Or Miller oils as in these pages recently. Bill Reply Report as offensive Link. Specifically a '89 2. Bearing in mind repairs to the engine would probably cost more than the car's worth :- Reply Report as offensive Link.
Especially if it might not have had the best oils during its hard life, and may be higher milage than indicated. What concerns me are the comments regarding the "cleaning" effects of high performance oils, and their thinness, and what the practical effect of this would be in a worn engine, with deteriorating seals.
Wed 6 Feb Ford oil - David W. Bogush, I regard it as very important to use a quality oil in an older engine to give it the best chance of being an even older engine. An absolute bargain for a good oil. I too have tried super de-luxe fully synthetic and found it just seemed to seep away. So it seems to be a bad idea to upgrade oil on a worn engine, especially after reading some of the comments about that on other threads. And I doubted that on a well worn engine the same spec oil as on the new run in engine would be appropriate.
I'll give the Ford stuff a try next time DW. As a family we include a one owner Nova 1. It's whole life has been school run, shopping trips and teaching son to drive, twice Don't ask! Additionally, as this new system launches, customers may find that packaging may vary as the previous system of identifying Engine Oil is phased out. One of the most important things to remember though is that our Halfords expert colleagues are readily available in store to ensure that you find the Engine Oil that is right for you.
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