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23rd November 2006, 11:49 | #1 |
Gets stuck in
Rover 75 CDTi Conn. SE Join Date: Nov 2006
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A quick guide to the different oil grades
Never change "down".
If your car has been running on fully synthetic for 3 years - DO NOT change "down" to semi - etc. Spôôk
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My Rover 75 after i did the latest mods [SIGPIC][/SIGPIC] Last edited by Spôôk; 23rd November 2006 at 12:45.. Reason: Table got smashed |
23rd November 2006, 12:12 | #2 |
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Spook did you mean to post this twice?
I have merged the thread but will leave it to you to delete one or the other duplicate posts note, some of your text is white on white |
24th November 2006, 06:10 | #3 |
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Sorry, but I disagree with many of the comments in the table - these are not attributable simply to the viscosity grade, they are more to do with the base stock performance and additive formulation.
However, I agree, once settled with an oil choice, stick with it! And likewise, don't switch to synth from semi or mineral on a high mile engine. And these days a full synth can be called that despite being a mineral oil. It's a legal issue based around performance, and Grp 3 mineral oils are highly refined and hydro-treated - so you pay your money and you get your quality. Last edited by MartinW; 24th November 2006 at 06:12.. |
28th November 2006, 01:42 | #4 | |
I really should get out more.......
2003 Rover 75 Conn. SE Auto Tourer 131 ps CDTi Join Date: Nov 2006
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Oils
Quote:
If that is true then it's pretty misleading in my opinion. How can a mineral oil be called synthetic. That's confusing. Did they decide that in Strasbourg ? ( the place of straight bananas, cheddar cheese and melton mobray pies)
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Rover 75 CDTi SE Connoisseur Tourer (2003) In desirable STARLIGHT SILVER (now restored to it's former glory with all the chrome !) |
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28th November 2006, 05:45 | #5 |
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The decision was made in the US, and Chevron were one of the main proponents for calling it synthetic. Their arguement is that the Grp 4 PAOs synthetics are based on product derived originally from crude oil, and therefore Grp 3 is hydro-cracked and thus synthetised to achieve a similar level of performance.
Synthetic is a broad term relating to man made, and usually implies identical molecular structure to have predictable and superior performance compared to mineral oils. The biggest con is semi-synthetic as there is no regulation on what quantity of synthetic and mineral must be present. |
28th November 2006, 12:15 | #6 | |
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15 years of 75s & ZTs now an XTrail Join Date: Nov 2006
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Quote:
On a high mileage truck, the high detergent oil we sold would clean the gum out of the engines caused by the cheap sometimes monograde oils, causing the most ominous rattles and sometimes dire consequences. We learnt quickly and only advised the use of these high quality oils for new or nearly new vehicles. People should remember synthetic products have to be made from something and most will be made of something originally mineral or organic. Unless imported from Mars? :lol: Dave |
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