Rock Oil XRP 5w30 Increases BHP – Myth or Fact?

Rock Oil

Well, Rock Oil Synthesis XRP is a fully synthetic motorcycle oil developed for racing. XRP has been around for nearly 10 years now with claims that it can ‘increase horse power’, but is this statement actually true and exactly how could it increase BHP?

BMW S1000R run on XRP
A 2010 BMW S1000RR being filled with XRP 5w30 just before being run on a Dyno

Earlier this year a Rock Oil importer based in Hong Kong (Sanwa Motorcycles) tested the XRP BHP increase on a BMW S1000RR against the OEM recommended oil (full story on the Rock Oil website).

The Dyno run showed a 4bhp increase in the S1000RR running XRP (from 175.6 to 179.5 BHP!).

But how does XRP achieve this increase?

Firstly, it should be pointed out that XRP doesn’t actually increase horse power throughout the engine. It actually increases HP at the rear wheel.
The HP gain is mainly due to the low drag formula of XRP. Basically, when the engine is running it generates the power (usually measured in BHP or brake horse power at the crank shaft), the BHP at the crank shaft is the ‘raw power’ (so to speak) and as this power travels through the engine, gearbox and drive chain certain elements lessen the BHP (which is why HP at the rear wheel is always lower then at the crank shaft).

XRP Dyno increase printout
A really poor photo (sorry!) showing the BHP increase on the BMW S1000 RR

One of the elements that ‘scrub off’ a bit of BHP is drag or friction caused by the engine oil (think of running in water, you can’t walk through water faster then you can out of the water!). XRP’s formula causes less friction or drag which means less BHP is lost in the engine, this low drag is probably also partly responsible for the slicker gear changes and slight MPG increase some users have noted (a users experience here).
XRP also helps to save a little weight over lower spec oils. 1 litre of 10w40 mineral oil weighs around 962g in the bottle, XRP weighs approx 930g in the bottle and 4 litres of 10w40 mineral weighs 3660g, 4 litres of XRP weighs 3580g (again, both in the bottles).

XRP 5w30
Rock Oil XRP is in stock and available from WhiteDogBikes here!

Rock Oil XRP is also extensively used by current Rock Oil sponsored race teams including Gearlink Kawasaki (BSB), Buildbase BMW (BSB) and HM Plant/Padgett’s (in the 2013 North West 200 and IOM TT)

Nicole McAleer BSB
Nicole McAleer on the Gearlink Kawasaki ZX6R Ninja running Synthesis XRP 5w30 in the engine!

One thought on “Rock Oil XRP 5w30 Increases BHP – Myth or Fact?”

  1. “Firstly, it should be pointed out that XRP doesn’t actually increase brake horse power throughout the engine. It actually increases BHP at the rear wheel.
    The BHP gain is mainly due to the low drag formula of XRP. Basically, when the engine is running it generates the power (usually measured in BHP or brake horse power), the BHP at the crank shaft is the ‘raw power’ (so to speak) and as this power travels through the engine, gearbox and drive chain certain elements lessen the BHP (which is why BHP at the rear wheel is always lower then at the crank shaft).”

    It is not possible to measure Bhp at the wheel, Bhp is “Brake Horsepower” and is measured at the crankshaft on an engine dyno. Rolling road dynos measure hp.

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