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Suzuki 800 Intruder Club & Forum

A UK Site Dedicated To The Suzuki C800, VL800, VX800, M800, VZ800, VS800, C50, M50 Model Intruder / Boulevard / Marauder
 
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 Synthetic or not?

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EazyDuz
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PostSubject: Synthetic or not?   Sun Mar 12, 2017 12:51 pm

On all the bikes and cars i've owned for tens of thousands of miles ive used Castrol GTX semi synthetic car oil with no issues with clutch slip or oil loss in the bikes (car has always used some though).
GTX full synthetic is on offer for £16 for 4 litres, is there any harm at all in switching to it? I've heard rumours not to on higher mileage vehicles as the part synthetic can help block areas which would otherwise begin to leak, its also apparently harsher on seals.
Bike is on 13k, car is on 75k.
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v-twin
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PostSubject: Re: Synthetic or not?   Sun Mar 12, 2017 1:14 pm

I have always used Car Oil for Cars and Bike oil for Bikes. Semi for older & higher mileage & fully synthetic for newer or high performance engines. My two Suzuki's are using Shell AX7 Semi (http://www.opieoils.co.uk/p-73843-shell-advance-ax7-10w-40-four-stroke-engine-oil.aspx) and the BMW is using Shell Advance Ultra Performance Synthetic Bike Engine Oil (http://www.opieoils.co.uk/p-69341-shell-advance-ultra-4t-10w-40-performance-synthetic-bike-engine-oil.aspx).
As far as I am aware semi & fully synthetic will mix without any issues, but I personally would not put fully synthetic in the VL and I would definitely would not put car oil in it, but that's me. Car oil has friction additives in it and they are also not designed for the 'shear' forces within a bike engine, but in saying that the VL engine does not rev to 14k so it probably is not an issue.
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stingray
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PostSubject: Re: Synthetic or not?   Sun Mar 12, 2017 2:18 pm

Personally I only use bike oil in my bikes and would never use car oil. A mate of mine who has a Honda vt 750 Shadow used car oil and the clutch failed in less than 500 miles, repair shop insisted it was the direct result of using car oil.
This is only my personal opinion, everyone has to make thier own decision as to what they think is the best and safest oil to use.
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EazyDuz
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PostSubject: Re: Synthetic or not?   Sun Mar 12, 2017 3:23 pm

stingray wrote:
Personally I only use bike oil in my bikes and would never use car oil. A mate of mine who has a Honda vt 750 Shadow used car oil and the clutch failed in less than 500 miles, repair shop insisted it was the direct result of using car oil.
This is only my personal opinion, everyone has to make thier own decision as to what they think is the best and safest oil to use.

Depends on oil type, any oil branded as energy saving apparently have friction modifiers or something which causes the clutch to slip, but an oil change should eventually stop the slipping once the old oil has worn off the friction plates. Or the clutch was on its last legs anyway and its just coincidence.
Regardless I ran my GZ125, Virago 535, VL800 and now C800 all on GTX semi synth and never had a clutch go bad, or leaks.
But to be on the safe side I think ill stick with GTX semi synth and avoid fully synth since I dont know what oil type the engine was broken in with
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Mr Intruder
Suzuki800.com Founder ... & ... Senior Administrator
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PostSubject: Re: Synthetic or not?   Sun Mar 12, 2017 6:38 pm

I use fully synthetic in every one of my vehicles and alway will.
Main thing is to change your oil and filter regularly. All else is secondary.
However - fully synth's protective properties are such that cars and bikes that run it, do not recommend it's use in the running in period - basically as the engine does not 'break in' properly - not enough wear or friction. This gives you an idea of it's lubrication and anti-wear properties - i.e. excellent.

Additionally, it will keep it's grade over a better temperature range, has better anti-shear properties (important as bikes gearboxes run in the engine oil - very harsh environment).
I personally think it is worth the extra money - others do not. To my mind - all vehicles benefit, it is just how much you care about your engine and it's longevity.
Money often talks louder than facts.
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EazyDuz
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PostSubject: Re: Synthetic or not?   Fri Apr 07, 2017 4:55 pm

Bought this in the end

http://www.ebay.co.uk/itm/371317089949?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

The old Castrol GTX semi which came out looked fine to be honest, only covered 700 miles or so last year then it sat all winter.
But 5 litres for that price is reasonable since the bike only took 3400ml.
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v-twin
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PostSubject: Re: Synthetic or not?   Fri Apr 07, 2017 6:32 pm

thumup
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simbo
.. Mechanical Tart .. .. Site Moderator ..
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PostSubject: Re: Synthetic or not?   Fri Apr 07, 2017 8:21 pm

I used to use that in mine, well up to the job 
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