1996 Renault Espace ERG VALVE

Hello tigntub

Use synthetic oil
Because synthetic oil resists oxidation and viscosity breakdown better than ordinary motor oil, it does not break down or sludge up as fast as ordinary
Use Castrol GTX or Mobile 1.
Change your oil every 3,000 miles or 3 months, whichever comes first
Perform a Seafoam treatment every 18,000 miles, or every 6th oil change. Seafoam is a brand of engine treatment that will push its way through the passages where oil flows. This cleans any sludge out and washes it into the oil pan, where it can be easily drained away. Not only will the Seafoam treatment help fight the battle against oil sludge, but you will probably notice improved gas mileage after using the product