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Topic Review (Newest First)

  • 18-12-2009, 15:56
    sparky
    thanks for the info guys looks like i'll be buying 20/50
  • 18-12-2009, 15:37
    Marcol
    My SBC and SBF both run Duckhams Classic 20/50
  • 18-12-2009, 14:55
    stueeee

    Me too!

    From reading the Castrol Man's post, I would rather go with too much additive (within reason) rather than risk the massive amount of damage that shagged lobes/tappets would cause from not having enough.

    Other than the risk of blocking the filter -not in itself catstrophic as the bypass valve opens, the only other risk identified was of attack on silver alloy bearings. I don't know about really modern engines but I think that Rolls Royce were the last people to specify silver alloy (so-called Gitter metal) for their big end bearings, this was back in the days when one's Chauffeur sat out in the cold.
  • 18-12-2009, 14:15
    kapri
    Yup, I've seen that Rob but my thinking is that too low will definitely wipe your cam Bit like the failed brakes scenario, tail end the motor in front or scoot round the outside and take your chances ( one more than one occasion real world )

    I seem to remember that the ZDDPlus told you on the bottle what the ppm would be if added to a gallon of oil? I haven't any empty ones around here at the mo. I'll check up at Antons unit when I go up next.
  • 18-12-2009, 13:22
    Roscobbc
    Quote Originally Posted by kapri View Post
    Where did you find that in Portsmouth Pete ?

    I normally go with Halfords Classic oil , if it isn't Duckhams in a different tin I'll eat my hat !.I did a lot of research re what spec to use and whilst the cheap end of the market Comma / Morris mark their cans that they are that spec I'm suspect of them.


    Rob, when you treat with ZDDPlus the oil feels very different when rubbed between the fingers .Personally I'd rather run the rsk of having too much compared with too little
    I think that there is some evidence that too much ZDDP actually has a detrimental effect - you would need to do a detailed search on-line to find this info though.
  • 18-12-2009, 12:57
    kapri
    Where did you find that in Portsmouth Pete ?

    I normally go with Halfords Classic oil , if it isn't Duckhams in a different tin I'll eat my hat !.I did a lot of research re what spec to use and whilst the cheap end of the market Comma / Morris mark their cans that they are that spec I'm suspect of them.


    Rob, when you treat with ZDDPlus the oil feels very different when rubbed between the fingers .Personally I'd rather run the rsk of having too much compared with too little
  • 18-12-2009, 09:15
    PeteF
    Millers 20/50 is very good, old school oil for an old school engine design. Makes sense to me. Just paid 21 for 5lts in Portsmouth.
  • 18-12-2009, 08:23
    Roscobbc
    http://forums.corvetteforum.com/c3-t...ppet-oils.html

    Take a look at this link - things do get confusing! - very few few oil companies give specific ZDDP info - even the ZDDP additive mentioned at Burtons doesn't actually state what the percentage or ppm will be when oil is treated. Bottom line is that very few oils avaialable over the counter at your local car spares shop will have the additive. Even the ones that supposedly have it won't state the constituant parts. On the link above independant test houses have refuted manufacturers claims (like Valvoline VR1 mineral having less than half maker 1800 ppm!)
  • 18-12-2009, 07:31
    kapri
    Check this old thread out, you need to make sure the oil is for older engines due to the requirement for higher ZDDP to allow for metal to metal contact in older flat tappet cams. VERY important if breaking in a new 'old' engine.This is removed from newer oils as it damages catalytic converters.

    https://www.rodsnsods.co.uk/forum/sho...highlight=zddp


    ZDDP supplement is realily available from Burton Power as ZDDPlus.
  • 18-12-2009, 05:55
    Plumpcars
    As said above you need a 20/50.
    I use Penrite HPR30 which is a little dearer and harder to get but a quality oil.Seems to hold pressure better when warm.
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