The Mitsubishi Pajero Owners Club®

digger65 · Posted: Tue May 13, 2014 9:30 Post subject: which oil ?

Do i use 5/30 fully synthetic or 10/40 semi ?

Google · Sponsor

VIKI · Posted: Tue May 13, 2014 11:37 Post subject:

10/40 best in my opinion castrol GTD plus

BenKenobi · Posted: Tue May 13, 2014 11:43 Post subject:

Prepare for a bunfight - the Mitsubishi recommendation was based on the best available at the time the car was built, 10w/40 Semi Synth a recommendation that I no longer follow.

I use a fully synthetic 5w/40 because there is no reason not to - at least any reason that can be backed up by evidence as opposed to speculation. There are unfortunately a lot of 'myths' floating around that have their origins back when fully synth was a new thing. Fully synth oils - especially the Ester based are in a different league when compared to their 'dinosaur' based cousins - beware the 'Synthetic' label - like so many things 'Synthetic' means different things in different price ranges.

Oil technology has come a long way since the advent of Turbo's, Catalytics and DPF's - oh and better more consistent engineering.

I use fully synthetics on ALL my cars - one of which is nearly as old as me, I use either Shell Helix Ultra or Silkolene Pro S.

assassin · Posted: Tue May 13, 2014 13:11 Post subject:

10/40 semi-synthetic, this is what they were designed to run on and specified by the manufacturers; due to their sales markets the oil quality recommendation is quite low as many third world countries cannot get the quality oils available to us in Europe and Mitsubishi designed the engine to run on oils readily available.

Synthetic oils are not recommended because their oil film is too thin and this can cause premature engine wear from piston scuffing as the oil film is too thin. This is caused when the piston isn't quite central in the bore because it needs a thicker film of oil to keep it central.

As Ben sald, beware of a bunfight as many people think they know about oils and they don't, its mainly misconceptions based on marketing blurb which is designed to make you buy much higher quality oils then you need, which is solely for profit, their profit.

GCMS2012 · Posted: Tue May 13, 2014 19:12 Post subject:

I was told a similar thing to Assassin about using a 'thicker' oil (10/40)

As the engine wears, using a thicker oil also keeps the engine 'tight' and stops things being able to 'slop about'.

geodrome · Posted: Tue May 13, 2014 20:55 Post subject:

I made a mistake of not using the correct oil in a v6 Mondeo, happily used the 10/40 Castrol Magnatec I had been using in the Pajero. Goosed the valve train as it was to thick. Should have been Ford specific oil. Since then I have always followed the manufacturers recommended oil. Was really p'd off as I bought the car from my sister and brother in law never said anything.
Even the semi synthetic oils are being developed all the time just like the synthetic oils.