FAQ- Automotive

Oil drain intervals

The oil drain interval depends on the frequency of use of your car and also on the type of driving you do.
- For ordinary daily driving, you should follow the OEM's recommendations, either in your service hand book or on the in-car display.
- If you take part in track-days or performance meetings, you should shorten the oil drain intervals. Our technical hotline will be happy to discuss the possibilities according to your usage and driving style.
- Similarly, if your engine has been modified or tuned, you can no longer follow the OEM's recommendations. In this case also, you should shorten the period between oil changes. Again our technical hotline can give you advice depending on the modifications you made to your car.

300V Motorsport Range, 8100 or 6100? Which oil should I choose?

Our 300V Motorsport range of lubricants are specifically formulated for racing applications. They are based around Motul’s unique ESTER Core® technology which combines the best performing synthetic base oils including esters with bespoke dedicated chemical additives.
The result is unrivalled power increase, outstanding lubrication and optimal protection, the best conditions for ultimate victory! These lubricants have been developed for leading Factory Racing Teams Worldwide, but also have exactly the same availability to the general public!


8100 is Motul’s top of the range passenger car engine oil based on 100% synthetic technology containing esters. These products meet the up to date and most demanding OEM engine oil approval requirements. 8100 lubricants are available in the latest and fuel-efficient 0W grades. 8100 lubricants are the safest way to keep your engine protected and operating the way it was designed to, fully compliant with the car’s warranty, whether it is in stop-and-start traffic or at full speed on the motorways.
6100 is based around Motul’s Technosynthese® technology containing esters. 6100 Products come with a multitude of official OEM approvals making sure you are using the right oil for your car. 6100 is designed to be price competitive without sacrificing on quality and performance. They are available in a wide range of popular viscosity grades.

I am currently using a 15W-40 oil in my car engine. In very cold weather (-10 °C), when starting, I hear a clacking sound. What should I do?

Your engine probably has hydraulic tappets. At low temperatures, a 15W oil is too viscous to ensure the proper operation of such pushrods. You should therefore use a 10W-40 or 5W-40, depending on the OEM's recommendations – please refer to your handbook that came with the car or contact your nearest dealer

I am currently using a 15W-40 oil in the engine of my car which has more than 100,000 km/miles on the clock. I have noticed my oil consumption is high, so I wish to reduce it, but without incurring great expenses.

Oil consumption is a natural phenomenon in an engine, whether new or old. However, high consumption is probably more pronounced in engines that have been driven a greater number of kilometers/miles and have increased wear. Depending on the exact problem causing your high oil consumption, it can sometimes be reduced by altering the choice of your engine oil.
Changing to an oil that is more viscous than grade 40 when hot, such as 15W-50, 20W-50 or 15W-60 is more than likely to considerably reduce your oil consumption, without there being any risk to your engine.

What is the difference between petrol engine oil and diesel engine oil?

The constraints on oils in these two types of engines are not exactly identical. In particular, the minimum performance levels differ regarding to the ability to keep the surfaces of the engine clean. Nevertheless, virtually all products of the Motul range largely exceed these minimum levels and therefore meet the standards and approvals for both petrol and diesel engines, for example ACEA Ax / Bx or API Sx / Cx.

I am currently using an SAE 80W-90 oil in my car's manual gearbox. In cold weather, changing gears is very difficult during the first few kilometers. What can I do?

Here, we touch on the SAE viscosity grade classification for manual gearboxes. It works in similar ways to the engine viscosity grade system for a 2 part “Multigrade” viscosity product:
- A winter grade, the “80W” which is an indicator of the viscosity at cold temperatures (“W” still stands for “Winter”). The numbers go from 70W to 85W with 70W having the lowest viscosity at cold temperatures and 85W having the highest viscosity
- A hot grade, the “90” in the example above. Numbers go from 80 to 250 with 80 having the lowest viscosity at high temperatures and 250 having the highest viscosity.
Going back to the question itself, these difficulties are probably caused by using an oil that is too viscous when cold, preventing the synchromesh mechanism from working correctly. Changing to an oil with a 75W-90 viscosity grade should help to solve the problem, but always check the OEM’s recommended viscosity grade as listed in the handbook of the vehicle prior to making any change.

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