I got a pm on another forum asking me to contribute to this thread, hope it's okay. Going through the above posts it seems that some people are unsure what makes an oil a synthetic, semi etc, so have a look at this. http://www.opieoils.co.uk/pdfs/tech-articles/Basestock-categories-and-Descriptions.pdf There are a lot of things in the oil that affect how they behave and here is a description of several of them. http://www.opieoils.co.uk/pdfs/tech-articles/Oil-Additive-Package.pdf As you can see, they are important parts of the oil, but in cheaper oils, the quality of the additive package is often reduced as a way of producing a cheaper oil. Some of you are probably thinking that we suggest using good oils as they are more expensive, so we make more money. That's not the case, they may be more expensive, but there is less margin with them. A lot of other places will push for cheaper oils as they are making more money out of them. We would rather sell someone the best stuff for their bike or car, so it runs as well as it can, then they come back to us in the future. It an also work out cheaper to use a good oil - if you're using a basic oil and changing it 3 or 4 times a year, it will work out cheaper to make one change with a good oil (unless you are using something so basic it's only really suitable for lawnmowers). Own brand oils (whether they are from the bike manufacturer, a supermarket or a motor factor) are some of the most basic on the market. They are made by big companies (like Castrol, Mobil etc) but to the standard set by the company. That means that the oil only just meets the specifications it lists (or in some cases, it doesn't meet them, just claims to), whereas oils that proper oil companies are happy to put their name on will exceed the specifications. As an example of what you can get from one of the own brand oils, Millers were testing a few of the oils on the market and they found that one oil being sold as a 5w-40 was actually a 20w-40. Cheers Tim
I have been to these for oil and they give me some very good advice said ine oil is not good for that engine were another brand is and I have found that "oilman" is on alot of car fourms just advising on oil and thats it Sent from my GT-I9305
I know the oil I want, there isn't much choice with 10w 50 semi synth. My point was simply that DT's were the same (ish) price thats all. Same oil so worth looking round for a good price not an inferior oil. We use Morris oils at work which is good stuff and have 30,000miles between changes on our engines that are warranteed for 400.000miles.
