I'd been wasting my money on Mobil 1 as Mercedes recommend it. I dare say the recommendation comes from $$$ Mobil pay them to make the recommendation rather than the oil being superior to other top oils. I switched to HPR5 5W-40 which has the Mercedes 229.5 Approval. I can't fault it after using it for about a year now. I do 5,000km oil changes as I do lots of short trips and give the engine a fair bit of stick. The engine is silky smooth, makes no valvetrain noise and gets similar fuel economy to my previous oil. The bonus is it's half the price of Mobil 1 but the same quality. Love it.

I have been running Penrite 5W40 'Fully Synthetic' for over 6 year now in a 2009 Toyota Camry V6 & 4 years in a 2012 Ford Focus). Whether doing 'school runs' or holiday 'road trips', both cars run exceptionally well using this oil (winter/summer cold starts, smoothness, etc.) . Oil pressure is immediate on startup & oil consumption is minimal between services. A great 'value for money' fully synthetic engine oil..

I think its ok im not complaining but i think i with go back to nulon 5w -30 as my fuel milage has dropped a bit from 8 ltrs per hundred to 9.4 ltrs per 100 but otherwise its ok i just dont like how its dropped in fuel miiage

BA XR8 Manual. Bought the car at 163000kms, it's now at 570000kms. Since I bought it I've always used HPR 10, changing oil at every 15000kms. The car travels from central Vic to Melbourne (Docklands) & back every day & is definitely NOT babied. This engine is still dead smooth & dead quiet, Still pulls strong to red line when asked to, blows no smoke & doesn't need any oil top up between changes - Each 15000kms uses roughly 5-600mls. Most reliable engine I've ever owned & I'm sure that's largely due to the Penrite HPR 10. Love this oil!

Been using Penrites Gas10 since new, changing every 10k. Despite the dealers attempts to sow fear and uncertainty the result has been a reliable truck that hasnt had a problem and continues now in light family use.
Also use HPR 30 on older club permit cars with great results. I like to support a manufacturer that provides products for older machines (gearbox oils, shock absorber oil etc)

Purchased a old hilux with high kms, was running shell helix 15-40 and mechanic done roadworthy put castrol 15-40 in it, seem to run alright but was burning threw it. had rear main seal fixed and then swapped to HPR30
and so far the old ute runs better. i do have small timing chain rattle but that's due to old owner not doing regular maintenance.

Run this in my race engine and after 2 seasons pulled down the bottom end to replace rod and crank bearings. To my surprise minimal wear was noted, in fact the main bearings were reused and the rod bearings replaced as routine. Best oil I have used in this application.

Penrite recommended this oil as their preferred in my 1992 Mercedes 300ce AMG. I transitioned from mineral to semi-synthetic to full synthetic over the past seven years with no noise at all from the valve train and smooth idling. Within 100km of using the Penrite 10w-40w (extra 10) the engines lifters now chatter for what was at first maybe 5 seconds and now maybe 10 seconds, within the first 30k the engine has begun to idle roughly as if out of tune (It is not) I am very frustrated to have been recommended $68 worth of oil only to have to dump it, but I have no other choice. I have used Penrite premium mineral and semi in the past but would advise against their 'new' Extra 10 range and any of their synthetics for your pre 2000 vehicles.

I have been using penrite oil since 1957, used in tractors land cruiser rodeo, first bought a 200 ltr drum for 170 pounds, 340 dollers,that same drum used to last 3 years on the farm, used the same oil in all the farm machenery, it leaves the motors clean and no sludge, and smoother running.

I changed to this oil recently from the synthetic Valvoline 5-40 I had previously had in the car. I have to admit that my car is quieter on Penrite.I couldn't believe the difference. I have always been sceptical about oil companies claims. This one has changed my mind. As for the longer term I will have to wait and see .

I have been using HPR30 in my Model A Ford for a lot of years, four years ago I purchased a 351w Mach1 Mustang HPR30 is perfect for this as well, stays nice and clean in both engines. The HPR30 oil is perfect for these old engines that require the high Zinc content.

I purchased a classic 911 last year, which was quite clearly in dire need of a service.

One of the first things I changed was the engine oil. Going by previous service receipts, I could see that previous owners were using a Synthetic oil, without any Zinc content!

These cars have a flat tappet design, so a high Zinc content (1600 ppm) for engine protection is a must.

Maybe it's just my imagination (I think not) but the car runs a lot smoother now, and the 20W-60 gives a bit more protection than what Porsche specify.

So for me, it's overall a great choice, and I'm happy to use an Australian product as well.

Been using Penrite oil for years my wife's 2014 Ford Focus loves it but my BMW 323i is not so happy on HPR5 you can just tell its not perfect motor runs silent but feels sluggish of the mark. other then that i think its a great oil for everyday use my old Falcon loved it

I've used HPR Gas 10 exclusively in my LPG BA Falcon for the past decade. I change the oil and the filter (Ryco) every 10,000km. The car now has 469,000km on it. It's been the most reliable car I've ever owned...except for the smegging front rotors which have to be machined/replaced once a year.

Changed over from the castrol edge 5-30 normally purchased as the price savings seemed a little too good to ignore. Oil stays clean and all the performance is still there but does run about 10c hotter in both my xt forester with 90k and hsv senator ls3? Is this somthing that I should worry about??