5 Cold Start Mistakes That Wreck Your Engine (Avoid These)

hey drivers Brian your honest mechanic

here today we're looking into something

I see destroying engines way too often

cold start mistakes now I'm not being

dramatic when I say these mistakes can

literally cut 15,000 to 25,000 mil off

your engine's life so let's break down

the five biggest cold start mistakes

that are killing your engine and more

importantly how you can avoid them the

first mistake I often see is people

jumping in the car and immediately

revving their engine cold here's what's

actually happening inside when your

engine is cold all those metal

components your Pistons cylinder walls

everything they're actually smaller than

they should be metal expands when it

heats up and these parts are precisely

engineered to work at operating

temperature when you rev a cold engine

you're basically forcing these cold

contracted parts to Slam against each

other you might hear what we call piston

slap that rattling noise when your

engines cold those Pistons are literally

slapping against the cylinder walls

because they haven't expanded to their

proper size yet do this enough times and

you're looking at scored cylinder walls

and worn piston rings trust me that is

not a repair bill you want to see now

here's a surprising one that's bound to

stir up debate letting your car idle for

10 minutes in the driveway a lot of

people think this is the right way to

warm up their engine but it's actually

doing more harm than good here's why

when your engine's idling cold it's

running rich on fuel which means excess

fuel is seeping past those cold piston

rings and diluting your oil plus idling

doesn't generate much heat so the engine

warms up painfully slowly I've seen cars

take 15 to 20 minutes to reach operating

temperature just idling instead start

your car wait about 30 to 60 seconds for

the oil to circulate and then drive

gently the key word here is gently

driving under light load warms the

engine up faster and avoids the damage

caused by excessive idling speaking of

oil this next mistake is all about

what's flowing through your engine many

people Overlook the importance of using

the correct oil viscosity for their CLI

when your engine's cold the oil is

thicker and moves slower even modern

synthetic oils aren't immune to this in

those first few seconds after startup

your engine's parts are running with

minimal lubrication think about it your

oil pump is pushing thick cold oil

through tiny passages until it fully

circulates there's metal on-metal

contact that's why using the

manufacturer's recommended oil viscosity

is non-negotiable especially in Winter

and again those first 30 to 60 seconds

after startup are critical wait for the

oil to circulate before putting any load

on the engine now that your engine is

running let's talk about another common

habit that can cause serious damage

shutting down your engine before it's

fully warmed up you start your car drive

2 minutes to the store and shut it off

seems harmless right wrong during that

short run your engine hasn't gotten hot

enough to burn off moisture and fuel

that build up in the oil over time this

causes the oil to break down and

promotes internal corrosion it's

especially bad in Winter where short

trips are common and engines struggle to

reach optimal temperature to avoid this

try to plan your trip so your engine has

enough time to warm up fully if you're

only driving a short distance consider

walking or combining errands into one

longer trip it's better for your engine

and your wallet in the long run so

what's the correct cold start routine

it's simple start your engine and wait

30 to 60 seconds for the oil to

circulate Drive gently keep it under 2,5

100 revolutions per minute and avoid

Full Throttle until the temperature

gauge is in the normal range for

turbocharged engines give it a bit more

time before pushing boost these small

habits make a huge difference I've

rebuilt enough engines to see the

pattern the ones that fail early almost

always suffered from poor cold start

practices treat your engine right when

it's cold and it'll reward you with

years of reliable service