About this item.....
Rock Oil Guardian semi synthetic 10w40 motorcycle oil is a premium grade semi-synthetic 4 stroke engine oil that has been specially developed to meet the exacting demands of the latest
JASO MA2 oil specifications.
Guardian Motorbike 10/40 oil has been specifically blended to offer superb performance levels with outstanding protection to all internal engine components.
The advanced additive, high detergent formula of Guardian 10w-40 ensures maximum engine component protection and superior resistance to deposits and corrosion (meaning dirt and residue build up is greatly reduced in the engine), resulting in extended engine life and optimum performance under the most arduous of conditions including MX, road and track racing.
Guardian 10/40 provides engines with rapid cold start circulation, providing maximum protection during initial start up.
Rock Oil Guardian 10w-40 also passes the latest clutch friction tests to JASO MA2 standards, allowing safe, predictable use in wet clutch applications (which eliminates clutch slip and gearbox pitting) as well as providing outstanding gear protection and reduced phosphorous levels for excellent exhaust catalytic converter compatibility.
Benefits of using Guardian Semi Synthetic 10w40 Motorcycle Oil... - JASO MA and MA2 Approved oil which is safe to use in motorbike wet clutches and in bikes with catalytic converters in the exhaust
- As tried, tested and used by many MX, track and road racing teams (including Buildbase Honda, PAR Honda and many more!)
- Blended using mainly Group 1 (the best!) oil base stocks
- Safe and stable formula meaning Guardian coats and protects delicate engine parts and stays in grade longer
- High detergent formula means a minimum of waste deposit build up inside a motorbike engine
- Highly resistant to internal motorcycle engine corrosion and pitting
- Formulated to greatly extend engine and gearbox life whilst helping to achieve optimum performance levels
Oil type: Semi synthetic 4 stroke
Viscosity rating: 10w40
Approvals:JASO MA
JASO MA2
API SL
SAE 10w40
Available in 1, 4 and 25 litres. Not sure which oil you need for your bike? Ask Us! 
Postage information....
Postage price for this item: £5 (per order not per item)
Free delivery on orders over £60 (excluding post)
We can also deliver parts to Europe and some other countries Ask Us Here!
Please note: This item weighs
Per litre- 1 kg.
Delivery restrictions for items over 1kg may apply to some UK outer areas (Northern Ireland, Scottish outer areas, Isles of Wight, Man etc).
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Buying and return info...
Can you return this item for an exchange or refund?Yes, you can return this item up to 30 days after it has been delivered for a refund or exchange.
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Who are Whitedogbikes?White Dog Motorcycle Accessories are a small mail order motorcycle parts business based in Halesworth, Suffolk (on the east coast of the UK).
We have been selling motorbike and scooter parts and accessories since 2003.
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Do we have a shop you can visit?Yes, our address is:
You can also find our address and a map on our
Location Page
How can you contact us if you have a question?You can contact us using the details below (please note, if you are asking technical, measurement or fitment type questions please email as it gives us a chance to research our answer so we can give you the correct info):
You can also email us on our
contact us page
How much is postage on this item?Postage for this item is: £5 (per order not per item)
Free delivery on orders over £60 (excluding post)
Do you have this item in stock?
In stock
Normally sent same day if ordered before 12pm (Mon to Fri only).
Usually delivered in 1-3 working days. More info....
Questions and answers about this item....
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Here
Question: Would the Rock Oil Guardian 10w40 semi synthetic be suitable for my Honda CRF450 mx bike?
Answer: Yes, Rock Oil Guardian 10w40 is suitable for a CRF450 (and is used by a few MX racers and teams).
Question: Is Rock Oil Guardian 10w40 ok to use in a 2008 Kawasaki KX450F and how often should I change the oil?
Answer: Rock Oil Guardian 10w40 is fine for a Kawasaki KX450F (you should need about 1.2 litres for an oil change).
How often you change the oil would really depend on what your using the bike for.
If the bike is being used for competition or race use I would recommend changing the oil after every race meet.
If the bike is being used for non competitive off road use or green lane riding you would change the oil less frequently (about every 4 to 6 rides depending on how hard the bike is being ridden).
Question: Can you please recommend a mid priced oil for my 2004 Suzuki SV 1000?
Answer: For an 04 Suzuki SV1000 we would recommend Rock Oil Guardian 10w40 (you should need about 3.3 litres for an oil and filter change). You would also need a
Suzuki SV 1000 oil filter (OIF015).
Question: I just wanted to know what does JASO MA and JASO MA2 standard for oil mean?
Answer: Warning, the following part is a bit boring (unless your an oil anorak!):
JASO stands for an oil standards organisation known as the
Japanese Automotive Standards Organization.
In 1998 Jaso developed a set of standards for 4 stroke oils which were measured against an oils ability to resist clutch friction, slippage, protection offered against engine wear and pitting in the gear box (JASO-MA was the standard given to higher friction oils and JASO-MB to lower friction oils).
JASO-MA2 is a recent standard brought out by JASO for oils which meet the stringent motorcycle performance needs of later (and more modern) motorcycle engines.
The JASO MA and MA2 specifications are the only true motorcycle specific approvals available and as such are a sign that the oil has passed stringent motorcycle performance tests.
Question: Whats the difference between Rock Oil Motorcycle 10w40 semi synthetic and Guardian 10w40 semi synthetic?
Answer: Rock Oil Guardian 10w40 is a higher spec semi-synthetic motorcycle oil and is rated up to API SL (Motorcycle 10w40 is only rated to API SG).
Rock Oil Guardian 10w40 is mainly made from group 1 (the best!) oil base stocks,
Rock Oil Motorcycle 10w40 semi-synthetic is made from mainly group 3 base stocks (hence the lower spec).
Question: Which engine oil would you recommend for a 2011 Suzuki DL650-V V-Strom?
Answer: For a 2011 DL 650 VStrom we would recommend Rock Oil Guardian 10w40. You should need about 3.1 litres of oil for an engine oil and filter change.
You will also need a
Suzuki DL650 V-Strom oil filter (OIF015).
Question: What is the best oil to use for a 1992 Honda CG125 BR-K?
Answer: The best oil to use for a 92 Honda CG 125 would be a good quality semi synthetic 10/40 oil (like Rock Oil Guardian 10w40). You should need around 1 litre for an oil change. Although you could use a fully synthetic oil it would be a bit of overkill for a CG125!
Question: Which oil would you recommend for a 2003 Yamaha XV250 Virago?
Answer: We would recommend Rock Oil Guardian 10/40 for an 03 Yamaha XV 250. You should need around 1.8 litres for an oil and filter change.
Question: Which oil would you recommend for a 1978 Yamaha XS650 D with a tuned engine and ported with custom headers and megaphone pipes?
Answer: We would recommend Rock Oil Guardian 10/40 semi synthetic for an 78 tuned Yamaha XS650.
Rock Oil Guardian is a Jaso MA2 and API SL rated semi synth oil which means it is durable enough to protect a tuned motorbike engine.
Rock Oil Guardian 10w40 has been (and still is!) used extensively by road, track and MX racing teams due to the superb level of engine protection it offers.
Question: Which engine oil would you recommend for a 2009 Triumph America EFI?
Answer: For a 09 Triumph America EFI we would recommend Rock Oil Guardian 10/40. You should need about 3.8 litres of oil for an oil change.
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