Skip to main content
The Globe and Mail
Get full access to globeandmail.com
Support quality journalism
Just $1.99 per week for the first 24weeks
Just $1.99 per week for the first 24weeks
The Globe and Mail
Support quality journalism
Get full access to globeandmail.com
Globe and Mail website displayed on various devices
Just$1.99
per week
for the first 24weeks

var select={root:".js-sub-pencil",control:".js-sub-pencil-control",open:"o-sub-pencil--open",closed:"o-sub-pencil--closed"},dom={},allowExpand=!0;function pencilInit(o){var e=arguments.length>1&&void 0!==arguments[1]&&arguments[1];select.root=o,dom.root=document.querySelector(select.root),dom.root&&(dom.control=document.querySelector(select.control),dom.control.addEventListener("click",onToggleClicked),setPanelState(e),window.addEventListener("scroll",onWindowScroll),dom.root.removeAttribute("hidden"))}function isPanelOpen(){return dom.root.classList.contains(select.open)}function setPanelState(o){dom.root.classList[o?"add":"remove"](select.open),dom.root.classList[o?"remove":"add"](select.closed),dom.control.setAttribute("aria-expanded",o)}function onToggleClicked(){var l=!isPanelOpen();setPanelState(l)}function onWindowScroll(){console.log("scroll");var l=isPanelOpen(),n=0===(document.body.scrollTop||document.documentElement.scrollTop);n||l||!allowExpand?n&&l&&(allowExpand=!0,setPanelState(!1)):(allowExpand=!1,setPanelState(!0))}pencilInit(".js-sub-pencil",!1);

I recently bought a new Scion iM and, have so far put 400 kilometres on it. However, I need to take a trip, which will require me to drive for several hours at 110 km/h.

The manual says that for the first 1,000 kilometres, not to drive at extremely high speeds (what is considered a high speed?), to avoid sudden acceleration, not to drive continuously in low gear and not to drive at a constant speed for an extended period. What should I do? – Laura

You should be okay to take that trip, perhaps trying to vary engine speed on occasion, which will happen anyway if there are hills or a need to slow for or pass other vehicles. By high speed, the manufacturer is generally asking that you not run the engine at high revs. Frankly, your Scion and speed limits will prevent you from doing any harm in that respect.

Story continues below advertisement

The idea behind those warnings is to ensure the various internal metal parts from piston rings and bearings, to cylinder walls and transmission internals are heated and cooled over a range of temperatures, allowing them to "settle in".

The primary goal used to be to ensure the piston rings and cylinder walls develop a proper seal. Break-in or running-in, as it is sometimes called, is far less critical today than it was a few decades ago because of the closer tolerances and higher quality materials used these days.

The 400 kilometres you have already done will have taken care of the ring/cylinder wall issue. Another concern in the past was that the bearings and crankshaft become similarly settled-in. But here again, closer tolerances, more finely finished crankshaft surfaces and higher quality bearings have all but eliminated this concern.

If you avoid running that Scion at wide open throttle for hours and don't tackle steep mountain grades while towing a heavy trailer, you should be fine.

All-weather tires

Are all-weather tires effective in Manitoba, where winter temps average -20C? – David and Doreen

In a word – yes. These tires are not to be confused with all-season tires. Just like winter tires" are different than the old snow tires because of the science and development involved, all-weather tires benefit from similar advances. While a few less reputable retail outlets may try to pass all-season tires as all-weather, all-weather tires carry the Transport Canada-mandated snowflake/mountain symbol indicating they pass the same rigid standards required of winter tires.

Story continues below advertisement

All-season tires do not have this identification. The difference between the all-weather and all-season tire is that the all-weather tire is more capable in warmer weather and can actually be left on the vehicle year-round. All-season tires cannot cope with cold temperatures, let alone the frigid ones you experience in your part of the country.

Tires are a mixture of real and synthetic rubber, belts, binders, various other chemicals and carbon black to give them their colour. The mixture used in all-weather tires allows them to remain flexible at cold temperatures and yet not be too soft at high temperatures.

Like us on Facebook

Follow us on Instagram

Add us to your circles

Sign up for our weekly newsletter

Report an error Editorial code of conduct
Due to technical reasons, we have temporarily removed commenting from our articles. We hope to have this fixed soon. Thank you for your patience. If you are looking to give feedback on our new site, please send it along to feedback@globeandmail.com. If you want to write a letter to the editor, please forward to letters@globeandmail.com.

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff. Non-subscribers can read and sort comments but will not be able to engage with them in any way. Click here to subscribe.

If you would like to write a letter to the editor, please forward it to letters@globeandmail.com. Readers can also interact with The Globe on Facebook and Twitter .

Welcome to The Globe and Mail’s comment community. This is a space where subscribers can engage with each other and Globe staff.

We aim to create a safe and valuable space for discussion and debate. That means:

  • Treat others as you wish to be treated
  • Criticize ideas, not people
  • Stay on topic
  • Avoid the use of toxic and offensive language
  • Flag bad behaviour

Comments that violate our community guidelines will be removed.

Read our community guidelines here

Discussion loading ...

To view this site properly, enable cookies in your browser. Read our privacy policy to learn more.
How to enable cookies