Paul J Posted April 4, 2017 Report Share Posted April 4, 2017 Just been to Halfords 20/50 classic oil 5 litre £15.00 Paul Quote Link to post Share on other sites
mike3739 Posted April 4, 2017 Report Share Posted April 4, 2017 Good price thanks for posting Cheers Mike Quote Link to post Share on other sites
Motorsport Mickey Posted April 4, 2017 Report Share Posted April 4, 2017 Makes it more expensive when you add the necessary extra ZDDP into it. Mick Richards Quote Link to post Share on other sites
DaveN Posted April 4, 2017 Report Share Posted April 4, 2017 Does it really need it? Just asking! Quote Link to post Share on other sites
North London Mike Posted April 4, 2017 Report Share Posted April 4, 2017 Makes it more expensive when you add the necessary extra ZDDP into it. Mick Richards Mick What 20/50 has the required (ZDDP) amount ? Quote Link to post Share on other sites
Nigel Triumph Posted April 4, 2017 Report Share Posted April 4, 2017 I've used Halfords classic 20/50 oil for years, never had an engine problem that could be attributed to oil in tens of thousands of road miles. Maybe different for a racer? Nigel Quote Link to post Share on other sites
RogerH Posted April 4, 2017 Report Share Posted April 4, 2017 (edited) Hi Mike, Penrite 25w50 has 1080 ppm and works well. I think Halfords has a little less but still works well. Have a look at this http://www.p6club.com/content/oil-and-zddp Roger Edited April 4, 2017 by RogerH Quote Link to post Share on other sites
mike3739 Posted April 4, 2017 Report Share Posted April 4, 2017 I've used Halfords classic 20/50 oil for years, never had an engine problem that could be attributed to oil in tens of thousands of road miles. Maybe different for a racer? Nigel +1 Driven hard to boot. Cheers Mike Quote Link to post Share on other sites
iain Posted April 4, 2017 Report Share Posted April 4, 2017 Penrite 20/60. Classic light which is what they recommend for TR's has 1610 ppm ZDDP. Iain http://www.penriteoil.com.au/tech_pdfs_new/Right_Oil.pdf Quote Link to post Share on other sites
Richardtr3a Posted April 4, 2017 Report Share Posted April 4, 2017 What has happened to Castrol ? Quote Link to post Share on other sites
harrytr5 Posted April 4, 2017 Report Share Posted April 4, 2017 VR1 Racing oil.High in ZDDP. Around £40 5 litres. Regards Harry Quote Link to post Share on other sites
stillp Posted April 4, 2017 Report Share Posted April 4, 2017 I've emailed Halfords about the ZDDP content and will post result (if any). Pete Quote Link to post Share on other sites
Motorsport Mickey Posted April 4, 2017 Report Share Posted April 4, 2017 Mick What 20/50 has the required (ZDDP) amount ? Short answer there are a few, discerning opinion ( includes Peter our resident prof) seems to be that 1100-1200 are the sort of figures we should aim at. If you aren't stressing the engine ( ie revs) too often or hard then the medium ZDDP oils like Halfords or Comma should be ok. I always break in a new engine for the first 2 oil changes with a heavy concentrate ZDDP oil, I believe after that the "fussy" components that don't like scuffing (cam shafts and followers especially) can stand the Halfords or Comma levels as long as you don't get the red mist too often when overtaken by something lower in the food chain ! Going racing, what oils do I use ? Millers or Penrite. Check out the many oil threads in the search function, I seem to remember a similar thread only a month ago about Comma oil ZDDP Etc where many different views came to the fore. Mick Richards Quote Link to post Share on other sites
Hamish Posted April 5, 2017 Report Share Posted April 5, 2017 So could you use the less expensive halfords oil and an additive such as this https://uk.eastcoastadditives.com/products/east-coast-zddp And still be ok. Still about half the price of the higher priced higher zddp content oils. I understand it would be sensible to buy the oil designed with the higher Z content but .......... Quote Link to post Share on other sites
Motorsport Mickey Posted April 5, 2017 Report Share Posted April 5, 2017 I can see how being careful with money would be an important factor for you lmpecunious Audi A5 Quattro owners ! Lol. Mick Richards Quote Link to post Share on other sites
BrianC Posted April 5, 2017 Report Share Posted April 5, 2017 I have recently read a paper which suggests that the ZDDP needs to be included and thoroughly mixed with the oil and other ingredients during manufacture and that simply using it as an additive is far less effective. I would guess using an additive with cheaper oil is a waste of money better spent on buying an appropriate ZDDP-rich oil such as Penrite or Millers. Quote Link to post Share on other sites
Allan Westbury Posted April 5, 2017 Report Share Posted April 5, 2017 Thanks for a really interesting & useful thread guys. Roger's link to the Rover P6 club taught me a lot more than I knew about ZDDP and what it is there for. I have previously used the Halford's oil on occasion because of the price but changed to Penrite a couple of years ago when recommended by TRE. Nice to know that ( for once) I am using the right stuff! Quote Link to post Share on other sites
glasgow4a Posted April 5, 2017 Report Share Posted April 5, 2017 No discount on 20/50 oil with Halfords trade card im afraid tried today, Ian. Quote Link to post Share on other sites
RogerH Posted April 5, 2017 Report Share Posted April 5, 2017 Hi Allan, there is a big error in that P6 forum info. They refer to 1000ppm as 1% - I think not. more like 0.1% Roger Quote Link to post Share on other sites
Paul J Posted April 5, 2017 Author Report Share Posted April 5, 2017 Hi Allan, there is a big error in that P6 forum info. They refer to 1000ppm as 1% - I think not. more like 0.1% Roger Roger it seems the Halfords Classic is re branded Comma 20/50 classic and has a 0.08% zinc content, how does one convert to ppm. So if 0.1% zinc content is suitable the Halfords brand at 0.08% would be quite near the mark. Any way as a get you home or top up the Halfords/Comma would seem a reasonable buy imho. All interesting stuff. Paul Quote Link to post Share on other sites
RogerH Posted April 5, 2017 Report Share Posted April 5, 2017 Hi Paul, 1000 part/million (PPM) = 1/1000 = 0,1% So the Halfords would be 800PPM Roger Quote Link to post Share on other sites
Paul J Posted April 5, 2017 Author Report Share Posted April 5, 2017 (edited) Hi Paul, 1000 part/million (PPM) = 1/1000 = 0,1% So the Halfords would be 800PPM Roger That was easier than I had expected Roger, I can see now why you wear the hat????On another note had my first road trip with the Cornish section last night, a little apprehensive at taking on 120 mile round trip but all went really well, lights even performed above expectation and a good group of people. Now searching for another excuse to drive it. Thanks Paul Edited April 5, 2017 by Paul J Quote Link to post Share on other sites
Hamish Posted April 5, 2017 Report Share Posted April 5, 2017 I can see how being careful with money would be an important factor for you lmpecunious Audi A5 Quattro owners ! Lol. Mick Richards Ha ha you bet. Ave 38mpg on the bloody Audi !!!! And with my name I have to be careful with the dosh.( So I can pay for the premium unleaded and addative for the TR. ) Quote Link to post Share on other sites
stillp Posted April 5, 2017 Report Share Posted April 5, 2017 Reply today from Halfords, stating that "the attached Safety Data Sheet which holds all the information regarding the product". However it only gives the zinc content as <1%, so not much help. Pete Quote Link to post Share on other sites
oldtuckunder Posted April 5, 2017 Report Share Posted April 5, 2017 Penrite have an interesting paper on ZDDP, obviously concluding that their oil is good, but some of the technical detail is an interesting background. http://tikobv.nl/m/ZDDP.pdf Alan Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.