Outer Limits 4x4 Board

My question is what is a suitable engine oil for a td42 with turbo('88 gq) that has done almost 380,000kms but no known service history. Hasn't burnt any oil after 2,000kms using Castrol RX and genuine filters(oil light stays on longer might have to go back to ryco's) gets approx. 14l/100 around town(bit of a lead foot) 12.5 on highway. Engine runs well and recorded compressions of 525 to 575. Can i use Castrol jmax? i have searched and the info suggested using jmax on an engine like this may 'clean it up' causing noise and possible oil consumption Castrol tech line recommended rx or crf multigrade. What are peoples experiences/thoughts?

Thanks for any helpful replies.

busman wrote:My question is what is a suitable engine oil for a td42 with turbo('88 gq) that has done almost 380,000kms but no known service history. Hasn't burnt any oil after 2,000kms using Castrol RX and genuine filters(oil light stays on longer might have to go back to ryco's) gets approx. 14l/100 around town(bit of a lead foot) 12.5 on highway. Engine runs well and recorded compressions of 525 to 575. Can i use Castrol jmax? i have searched and the info suggested using jmax on an engine like this may 'clean it up' causing noise and possible oil consumption Castrol tech line recommended rx or crf multigrade. What are peoples experiences/thoughts?

Thanks for any helpful replies.

change oil filter to cummins fleetguard part number LF3314 and oil light issues should be sorted out as they go out fairly quickly.

in regards to suitable engine oil... each to their own.... penrite was good for me...

i am a mechanic at a nissan dealer and we use mobil delvac 15w 40 in our diesel engines its good oil

Shell Rimula-x and nissan filters. Nissan filters never had an issue with the light stayin on with mine but I use nissan filters..

they worked for woops GQ for 560,000klms and still had cross hatching in the bores from new...