Post by
Q45tech »
https://forums.nicoclub.com/q45tech-u112.html
Sat Oct 10, 2009 8:17 am
For the past 19.5 years and 323,600 miles my 90 Q45 engine has used an assortment of premium oils, in different viscosities based on time of year and temperature. Mobil1, Valvoline, Redline, Walmart........0-5-10w30-40-50
Regardless of the brand I've change oil and filter every 90 days* because the filter size is inadequate too allow longer service. Wasteful of synthetics but immaterial in the scheme of things.95% of the 84 filter have been oem.
The point is to have the vehicle on a lift every 90 days to examine everything in detail and to plan the future next year work intervals.So that you have plenty of time to obtain consumables: plugs, belts, bushings , bearings, liquids and filters.
* the shortest intervals were 6 weeks when I did some serious interstate mileages for 6 months doing 1000+ miles per week with Mobil 1 syn.