e.g. engine has 5W-30 in and you want to top up with 5W-40. Both grades of engine oil are listed as suitable for car model.
2007-08-30 10:10:31 · 16 answers · asked by robokombot 2 in Cars & Transportation ➔ Maintenance & Repairs
Some people really don't understand oil. You can mix grades, and you can mix synthetic and dino oil safely, as long as they meet or exceed the specifications of the motor you have. 1 litre of 5-40 with 4 litres of 5-30 would give you an effective mix of about 5-32. None of the oil will degrade faster, and there will be no sludge formation or any other ill effects. Mind you the only reason for ever topping up with a different grade should be the fact you are low, at home or in the middle of nowhere, and that is the only bottle of oil you have available.
2007-08-30 10:45:46 · answer #1 · answered by Fred C 7 · 1⤊ 0⤋
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RE:
Does it matter if you mix different grades of engine oil in your car?
e.g. engine has 5W-30 in and you want to top up with 5W-40. Both grades of engine oil are listed as suitable for car model.
2015-08-05 22:12:05 · answer #4 · answered by Anonymous · 0⤊ 0⤋
This totally depends on the climate...But more importantly ...
What type of oil Straight or Synthetic?
Mix the two together isn't the greatest idea...
As a rule of thumb once you use Synthetic it's wise to stay with it...Not to mention how much your vehicle will benefit from it.
Aside from that just going from 5 30 to 5 40 won't hurt anything until your next oil change.
2007-08-30 10:22:59 · answer #5 · answered by blackwolf917 2 · 0⤊ 0⤋
Technically yes, but realistically, no. The only difference is how cold it can be before your oil's viscosity will be overwhelmed. The 30 means it's thicker and will be sustainable to higher temperatures (i.e. high RPMs or older V8's) and the oil takes longer to get thinner. The 40w is thinner and will circulate through your engine faster/earlier than the 30w will. Your location will determine whether you would want the 5w-40. Most 4/6cylinder cars today use it to avoid possible problems due to geographical issues and whether or not it's a performance engine. Otherwise, you're fine and no problems will be incurred.
2007-08-30 10:20:51 · answer #6 · answered by rdbcatcher 2 · 0⤊ 3⤋
Well the difference is the viscosity of oil, too thin and it will not lubricate and too thinck, you put the oil pump under too much pressure.
You should stick to the grade that your manuvacturer states in your owners handbook or you will be asking for trouble.
I over filled my car once and I nearly killed it. Oil has a job to do and using the wrong sort is similar to putting Derv in your Petrol tank.
2007-08-30 23:03:38 · answer #7 · answered by cheek_of_it_all 5 · 0⤊ 0⤋
No. I knew a guy who used to take oil from cars he changed the oil in and the last bit in the btm of the container, he would save in a jug, when he had about 5 litres of this mixture of different oils he would change the oil in his own 50K pound car. Never had any problems.
2007-08-30 10:20:51 · answer #8 · answered by Anonymous · 0⤊ 0⤋
If you mix one litre of 5W-30 with 1 litre of 5W-40 you get 2 litres of 5W-35.
In other words, you can mix the oils as you wish. Just don't mix synthetic and mineral oils. This would be disastrous.
Also, don't mix oils for diesels with oils for petrol's.
2007-08-30 21:22:09 · answer #9 · answered by Anonymous · 0⤊ 1⤋
mix grades in summer is ok
do not mix brands, one brands additives are incompatible with anothers,,
in fact one brands additives are synergistic , messing with that
chemistry is very very risky.
simple if you have chevron 5w30 , mix in some other chevron.
thats right off the OEMS web sites. (oil engineers logs)
BTW: just because someone walks across a freeway blindfolded does not mean its safe to do so.
understand?
2007-08-30 11:05:24 · answer #10 · answered by gearhead 2 · 0⤊ 0⤋