Is it possible to use a more modern type of oil in these very old engines?

Millers Oils France » FAQ » Classic » Classic Engine Oil FAQs » Is it possible to use a more modern type of oil in these very old engines?
Which oil should I use in my vintage car or bike engine?
Which oil should I use in my vintage car or bike engine?
11th April 2013
Millers Classic 20W50 Mineral Engine Oil
Which engines would use Millers Classic Pistoneeze 20w50?
11th April 2013
Millers Classic Pistoneeze P30 oil with low treat detergent

Millers Classic Pistoneeze P30 oil with low treat detergent

Not at all. Modern engines are designed to run on an oil with very low viscosity (thin), such as 0W and 5W. These are too weak for older engines, which have been designed to operate with a viscosity of 20w in winter and 30 or 40 in summer.

However, our later formulations, Pistoneeze and all our multigrades are detergent oils.   Detergents keep the oil clean by holding the products of combustion in suspension in the oil and prevent the formation of sludge in the sump.   It is possible to use these types of oil (of the correct viscosity) providing you are sure that the engine is clean inside and does not have any build up of sludge.   This will be the case if it has been freshly rebuilt or is already running on a detergent oil.

For details of our full range of classic products please click here.

For other related useful info please refer to our FAQs Classic page.