Thanks for the pic of the missing book. I have to admit - I like working on my RR. I am a new bilateral amputee and cant tell you how therapeutic it is to get back under a car. Anyway - land rover knoxville recommended 8K. I agree that synthetics are the difference. Interestingly, some vehicles with longer service intervals use a large amount of oil in theory giving a larger reservoir of detergent. The TD6 only holds 4 qts. Just my thoughts ... the oil discussions on discoweb seem to never end.