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  1. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    Thanks for the advice. I made up my mind to get a 15w40 HDEO. Will have to hunt the thickest in 15w40 HDEO category since 15w50 or 20w50 aren't available. Ha ha.. yeah!! Some claim it should be adjusted when the engine is warm. Some say it should be done while its cold. Point is getting it just...
  2. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    On Average, the temperatures vary between 22C (72F) and 32C (90F). And 34C (93.2F) being recorded high in summer.
  3. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    That's giving some confidence to try out Shell Rimula (Indian equivalent of Rotella) or Mobil Delvac. Both come in 15w40 ratings. In addition to that, the workshop manual published by Pete Snidal, suggests getting 40 weight if the conditions doesn't get extremely hot. Rightly said! There are...
  4. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    Ah, that 5speed olive green looks so classy! Okay, though there are plenty of them locally available with appropriate viscosity (15w50 or 20w50) ratings, the inexpensive ones don't have ZDDP additives. And most of them don't publish their datasheet and safety sheets online to get much idea...
  5. R

    15W40 HDEO on Royal Enfield Bullet CI 350

    I am from the southern part of India and the temperatures are between 20c (68F) to 38c (100F). The recommended oil for RE 350 is 15W50 or 20W50. The clutch and gear boxes are seperate and hence I'm interested in trying out Heavy Duty Diesel Engine oil. Does 15W40 CH-4 / CI-4 / CJ-4 HDDEO oil...
  6. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    Ha ha. I also believe that frequent OCI is better than running long, just because it's recommended by the oil manufacturer. I'll give this particular CNG oil a try, will drain it in 1000kms or less than that and see how it behaves. Thank you ! I purchased the motorcycle last month and it needed...
  7. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    Thanks for checking availability of those oils in India. RE motorcycles until 2008, had seperate gear box, and seperate clutch case. So there are some options open to try. My interest is to first look out for 15W-50 or 20W-50 rated HDEO. 50 being a better oil for hot conditions, I prefer to stay...
  8. R

    20W 50 CF4 on 1970 Royal Enfield iron barrel

    The only reason for considering Gulf 20w 50 CNG is because of its MSDS showing ZDDP content between 0.61 - 1.13 % I don't find msds data readily available online for lubricant manufacturers in India. And have to rely on the very few that publish data like Gulf, Total and equally available in...
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    20W 50 CF4 on 1970 Royal Enfield iron barrel

    I'm a fan of HDDEO as they have superior anti wear additives, particularly ZDDP. I'm particularly looking at HDDEO 15W-50 or 20W-50 as they can be used with old motorcycle engines that does not have integrated clutch, though wet clutch assembly reside in a seperate compartment. I'm hoping heavy...
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