Due an oil change. Whats the benifit of full synthetic over semi synthetic?
17 November 2007, 03:32 PM
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Due an oil change. Whats the benifit of full synthetic over semi synthetic?
Hi all,
Due an oil change and after reading all the threads on the forum I'm thinking of going the Shell Helix route at somehting like 5w/40 for the winter.
But do I go full or semi synthetic? Whats the difference other than price
Due an oil change and after reading all the threads on the forum I'm thinking of going the Shell Helix route at somehting like 5w/40 for the winter.
But do I go full or semi synthetic? Whats the difference other than price
26 November 2007, 09:06 AM
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A lot of people have problems with fully syn as it is too thin.
Castrol Syntrax is a good semi-syn oil that I have never had any problems with. In one case, it actually got rid of a synchro crunch!
You can get the stuff either from ebay or halfords.
Castrol Syntrax is a good semi-syn oil that I have never had any problems with. In one case, it actually got rid of a synchro crunch!
You can get the stuff either from ebay or halfords.
26 November 2007, 09:31 AM
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I guess it's down to how you use your car. Over ten years and 4 Subaru's, 2 Legacy RS turbos, 1 Impreza 2WD and 1 Impreza AWD, I have had no problems running sythetics in both the engine and gearbox/diffs etc. I have recently returned to Subaru after an unbelieveable 12 months with a VW Golf, what a load of rubbish that was. I now have a 2003 Impreza RX auto (Wifey can't drive a manual).
Last edited by Klaatu; 26 November 2007 at 09:32 AM. Reason: Spelling
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26 November 2007, 03:11 PM
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Reasons to go fully synth include modding your engine to greatly increase the power and running the car to it's limits - i.e. trackdays etc. Both will tend to expose the oil to higher temperatures.
As your car/engine should be well run in, try...
Miller CFS 10/40 or 10/60 if you're doing trackdays or use it very hard.
Motul 300V 15/50
I've used Shell Helix Ultra 5/40 in the past. Currently, I'm running Motul 300V 15/50 and I have 5 litres of CFS 10/40 in the garage.
Prices from AS Performance are quite reasonable.
J.
27 November 2007, 05:18 PM
#9
The problem is they can be too slippy for the synchromesh sometimes, and these are usually the high ester based ones. In a way they are too higher quality for the synchro and the use of a mineral semi being more grippy tends to solve the problem.
We find that pre sort of 98 models are happier on semi and post 98 are find on synthetic.
Cheers
Guy.
27 November 2007, 06:37 PM
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Sorry to jump in on the thread.
I drive my99 type-r very hard,
Which would you recomend, my oil and filter change is due next month (I do it every 3 months) I do about 3000 miles in that time
Miller CFS 10/40
Miller CFS 10/60
Motul 300V 15/50
Remember the next 3 months are going to be alot colder thn the past few...
Cheers
I drive my99 type-r very hard,
Which would you recomend, my oil and filter change is due next month (I do it every 3 months) I do about 3000 miles in that time
Miller CFS 10/40
Miller CFS 10/60
Motul 300V 15/50
Remember the next 3 months are going to be alot colder thn the past few...
Cheers
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