Oil - to change or not to change?

[Colvic Watson]

Hi Vyv and others. I read your site on engine oil and in my ignorance couldn't decide what grade of oil for a late 1970's Thornycroft 230? I know not to go synthetic but could you or someone else spell it out for me!

Thanks.

SAE 15>40 CF or CF4 from local SM

Thanks - what's a SM?

 

[Rossynant]

SuperMarket? CF-4 may be better, it's for heavy duty direct injected engines (severe engine service), CF for indirect injection old ones. Can be found as 'marine grade', I got it in marina store for less then lowest supermarket price

 

[Colvic Watson]

Thanks, I wouldn't have guessed that. All I need to do now is work out if a Thornycroft 230 is direct or indirect injected

 

[sailorman]

Thanks, I wouldn't have guessed that. All I need to do now is work out if a Thornycroft 230 is direct or indirect injected

dont worry
CF 4 will be fine
trust me Im a doctor

http://www.commaoil.com/productsguide/view/6/251/SUP5L

 

[Latestarter1]

Thanks, I wouldn't have guessed that. All I need to do now is work out if a Thornycroft 230 is direct or indirect injected

Thornycroft 230 is a marinised Leyland 4/98 direct injection engine.

Super engine just look after the coolant, good easy starting motor.

 

[Colvic Watson]

Thornycroft 230 is a marinised Leyland 4/98 direct injection engine.

Super engine just look after the coolant, good easy starting motor.

Thanks Latestarter1 I asked about the engine about two years ago and you gave me some very helpful advice, partly convinced me the boat was right for us. It's never failed to start once we had the diesel pump serviced - left for two years and seals had perished - and lift pump replaced -pinhole leak. I got some of that DCA4 you recommended, pricy stuff but as you said it protects against cavitation and corrosion of the wet liners.

 

[sailorman]

http://www.ybw.com/forums/showthread.php?t=343553