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#4612121 - 12/23/17 11:11 AM Oil consumption
Matt97 Offline

Registered: 03/22/16
Posts: 56
Loc: South Africa
I have a motor repair shop and find that straight SAE 40 oil works wonders for minimising leaks and reducing engine noise on older vehicles. Bear in mind that i am in South Africa so low temperatures are not an issue .On one of my personal vehicles ,Mazda 323, B3 engine i found that using 20W50 and `15w40 oils would have the dipstick showing on the min level every two weeks ,this started happening when the car reached 200 000km .Started using Magnatec 10w40 and this has stopped ,oil consumption over 5000km is now minimal, not even showing on the dipstick .

How is this possible ?
The Mazda B3 engine was designed in the eighties and only calls for a basic 20w50 multigrade oil .Magnatec is Champagne to that motor! Any views as to why the sudden improvement in oil consumption ?

#4612129 - 12/23/17 11:19 AM Re: Oil consumption [Re: Matt97]
bmwtechguy Offline

Registered: 06/15/04
Posts: 2662
Loc: South Carolina
Some oils just work better than others in a particular engine. You found one that works! Stick with that one if it is cost effective.

#4612130 - 12/23/17 11:21 AM Re: Oil consumption [Re: Matt97]
skyactiv Offline

Registered: 03/02/13
Posts: 4048
Loc: The Midwest
Some of the oils you used may be low quailty group I oil with very high noack volatility and/or the better oil cleaned up the piston rings if they were sticky.
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

#4612161 - 12/23/17 11:52 AM Re: Oil consumption [Re: Matt97]
JMJNet Offline

Registered: 09/06/07
Posts: 884
Loc: TX, USA
It is a process called "Aging". I know it is a machine but they do age, the metal wears out, tolerance is going out, etc.
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel

#4612168 - 12/23/17 12:04 PM Re: Oil consumption [Re: skyactiv]
Linctex Online   content

Registered: 12/31/16
Posts: 5233
Loc: Waco, TX
Originally Posted By: skyactiv
Some of the oils you used may be low quality group I oil with very high NOACK volatility and/or the better oil cleaned up the piston rings if they were sticky.

This is my thought.

Sometimes, a high quality oil can fix several problems.
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

#4612192 - 12/23/17 12:29 PM Re: Oil consumption [Re: Linctex]
Matt97 Offline

Registered: 03/22/16
Posts: 56
Loc: South Africa
Previous oils were Total and Shell multigrades .Must add that the car never visibily smoked yet you could see the evidence in the tailpipe of oil burning