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Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5369960 03/07/20 03:16 PM
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During my turbocharged race car days, I'd typically use Mobil 1, 15W-50. However, M1 V-Twin 20W-50 did provide a bit more oil pressure during 100 degree track days.

No issues at all with the motorcycle oil in automotive use.


People who count on their fingers should maintain a discreet silence.
Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5370356 03/08/20 02:56 AM
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What is tipical TBN level of motocycle oils? I would guess that it is lower from PCMO oil since it is intended for only seasonal use...


2008 Toyota Yaris 1ND-TV 1.4 D4-D Tech9 (Shell?) 5W30 C3 VW 504/507
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10W-40
Re: 4 stroke bike oils in cars? [Re: Kamele0N] #5370359 03/08/20 03:10 AM
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Originally Posted by Kamele0N
What is tipical TBN level of motocycle oils? I would guess that it is lower from PCMO oil since it is intended for only seasonal use...

The Castrol semi-synthetic 10W40 motorcycle oil VOA linked to previous shows:
Moly 50ppm, Boron 60ppm and Zinc 1000 ppm with a great TBN of 9.3

For me a motorcycle is not seasonal, it was my only transport for years on end and 365 days per year, I was on my third bike before I got my first car.


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Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5370367 03/08/20 03:44 AM
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Motorcycle oil is certainly not made for seasonal use ! I use my odds for top ups in my car - last one was a litre of Penrite VTwin 20-50, and before that a litre of Penrite mineral motorcycle 20-50. I'm trying my hardest, but whatever I put in the Volvo, it just keeps going.


1987 BMW R65 - Penrite VTwin 20-50
2005 Nissan Expert - 5W-30 Castrol Edge
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5370371 03/08/20 03:54 AM
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Originally Posted by ChristianReske
There is a new trend in another forum. This is: Why not use a 4 stroke motorcycle oil in a car?

The postive points should be:
- Better VI improvers, more shearstable, better addtive package (meant for gear lubriaction, to - better EP additives) and generally more robust base oils and so on.

In short, a high quality motorcycle oil should work well in a car that is driven hard and sporty, better than a average car oil. Especially in engines with timing chain.
Or you could mix it with you car oil, to boost it up, as some kind of additive.

I read often that you schould not use Motorcycle oils in cars, but if i remember correctly the reasons explained dont convince me. I am shure that most bike oils today should also be safe for use with a catalytic converter.

Any thoughts or input to this?



The important fact here is wether or not the motorcycle oil you are looking it is for a WET clutch bike or a DRY clutch bike. BIG differences in formulation, we should only use DRY CLUTCH bike oil in cars.

Re: 4 stroke bike oils in cars? [Re: ARCOgraphite] #5370373 03/08/20 03:56 AM
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Originally Posted by ARCOgraphite
Ahh, the picture of the motorcycle on the bottle. Fools the fool every time.

If You have a 60's muscle car and you want a high(er) ZPD lube you can buy off the shelf for a reasonable price?



VR1 is available pretty much everywhere, for a cheap option with high zinc - maybe easier to source than a specialist motorcycle oil?

Re: 4 stroke bike oils in cars? [Re: Olas] #5370416 03/08/20 06:27 AM
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Originally Posted by Olas

The important fact here is wether or not the motorcycle oil you are looking it is for a WET clutch bike or a DRY clutch bike. BIG differences in formulation, we should only use DRY CLUTCH bike oil in cars.

Why ?
Not trying to be rude, I just don’t see why.

I know resource conserving cars oils with friction modifiers should not be used in wet clutch (shared sump) bikes, because they could make the bike clutch slip. But I’ve never heard of a problem the other way around (bike oil in a car).


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Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5371542 03/09/20 11:47 AM
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I can think of several reasons not to use 4-stroke motorcycle oil in an automotive application:
Significantly increased cost
Lack of friction modifiers
Refused warranty coverage and may actually void warranty
Use the right tool for the job (and this isn't it)

If you must add a boost to your "regular" car oil, buy an oil booster product (not recommended), or buy a quart of boutique oil with more Gp IV and Gp V base (e.g. Amsoil, Redline). Or just use the boutique oil instead of your regular stuff, it might be cheaper than 4-stroke oil.


1995 Corvette coupe LT1 6-speed
2006 Tacoma 2.7 Base SR5 AC
1999 Yamaha YZ400FL
2003 Honda XR400R
Re: 4 stroke bike oils in cars? [Re: ChristianReske] #5375237 03/13/20 08:04 AM
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Thank you all.

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