Section : General

Which Engine Oil

Posted By : Terry White, 17-May-2007, 04:43pm

• Which Engine Oil

  Posted By : Nigel Gibbins, 17-May-2007, 04:55pm

  I would have said that fully syth was a no-no... I use semi-synth in my racers gearbox and that seems good but a Mineral oil in the engine - Valvoline Racing 20/50.

  • Which Engine Oil

    Posted By : Mark Field, 17-May-2007, 07:02pm

    going on the tollerances that our cars run on the cranks and bearings ive never recomended that they run on fully synthetic weve found on the race and std engines that a good qualityt 20/50or 20/60 mineral is the best to run ,with a regular service interval as the engine would have been looked after on original sevices ie 6000 miles or six months i hope this may be a little help regards mark

    • Which Engine Oil

      Posted By : Leon Guyot, 17-May-2007, 08:49pm

      First off, I disagree with ONLY using mineral oil in our cars.
      
      Fully synthetic, if it is true fully synthetic is fine, as long as it is the correct viscosity of 20W/50.
      
      There is a lot of nonsense and mis-information on the subject of engine oil, quite possibly more than on any other subject, critical to the longevity of motor cars.
      
      I have run fully synthetic Valvoline Synpower 20W50 with complete success for 5 years now, although I am about to change to a different brand because of the significant reduction in anti-wear additives (ZDDP) here in the USA to below 1000ppm, (in API SM rated oil - check the label on your chosen oil, as it may be differently formulated in Europe).
      
      Also, John Kipping/Canley Classics has recommended the use of Mobil 1 (fully synthitic) for many years now.
      
      I recommend that everyone reads the following website, which is the best I have yet found on this tricky subject:
      
      www.lnengineering.com/oil.html
      
      p.s. do not believe what the oil companies may tell you, they will only say that their own oil is suitable for our cars and is the best!
      
      Regards
      
      Léon
      
      
      
      
      
      
      
      
      

      • Which Engine Oil

        Posted By : Terry White, 17-May-2007, 11:21pm

        Dear All
        Many thanks for your contributions.
        Regards
        Terry

        • Which Engine Oil

          Posted By : George Ralph, 18-May-2007, 08:21am

          For what it's worth, I run mine on Miller's 20/50 Classic Semi Synthetic 'cos they claim it's specially formulated for classic cars (and reasonably priced). As for performance, I found that compared to ordinary 20/50, the oil pressure at tickover (1000rpm) when hot is a stable 35psi instead of 25psi with the previous oil.
          
          At the risk of stealing the thread, any recommendations on gearbox oil? I pick up my rebuilt box tomorrow.