Is Valvoline 10W40 okay to use in the 2002 Falcon 4.0 litre?

A good quality 10W40 engine oil should be perfect for your car, Carol. Always go for a known brand of oil rather than the cheaper, Brand-X supermarket stuff, as quality varies enormously. Keeping clean, fresh oil in your engine is the absolute best piece of preventative maintenance there is.

Don’t forget to change the filter at the same time as there’s just no point putting clean oil through a dirty filter. By the way, the correct oil filter for your car is a Ryco Z9 or brand-equivalent.